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Condensed financial information of the parent company - Condensed statements of comprehensive income/(loss) (Details) | 12 Months Ended
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Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥)
Condensed statements of comprehensive income/(loss) |  |  |  |
Share-based compensation expense | ¥ (2,257,795) | $ (309,317) | ¥ (4,935,782) | ¥ (24,053,760)
General and administrative | (276,564,752) | (37,889,216) | (273,588,744) | (287,457,156)
Interest and investment income/(loss), net | 380,062,136 | 52,068,299 | 255,332,621 | 112,816,211
Foreign exchange gain/(loss), net | 20,658,172 | 2,830,158 | (2,931,704) | 250,234
Income from the repurchase of convertible senior notes |  |  |  | 10,028,456
Share of loss in subsidiaries, VIEs and VIEs' subsidiaries | (4,048,792) | (554,682) | 3,207,384 | 13,998,022
Net income/(loss) before income taxes | 157,537,018 | 21,582,482 | 101,474,055 | (269,623,829)
Income tax expense | 65,805,623 | 9,015,333 | 62,340,516 | 92,428,127
Net income/(loss) attributable to Qudian Inc.'s shareholders | 91,731,395 | 12,567,149 | 39,133,539 | (361,964,123)
Foreign currency translation adjustment | 37,882,398 | 5,189,867 | 21,829,283 | 13,036,988
Total comprehensive income/(loss) attributable to Qudian Inc.'s shareholders | 129,613,793 | 17,757,016 | 60,962,822 | (348,927,135)
Parent Company | Reportable legal entity |  |  |  |
Condensed statements of comprehensive income/(loss) |  |  |  |
Share-based compensation expense | (2,257,795) | (309,317) | (4,935,782) | (24,053,760)
General and administrative | (40,780,739) | (5,586,938) | (19,070,062) | (26,199,820)
Interest and investment income/(loss), net | 189,674,053 | 25,985,239 | 104,687,566 | (13,148,315)
Other non-interest income | 24,463,472 | 3,351,482 | 28,626,092 | 11,548,297
Foreign exchange gain/(loss), net | 20,792,611 | 2,848,576 | (545,948) | 404,232
Income from the repurchase of convertible senior notes |  |  |  | 10,028,456
Share of loss in subsidiaries, VIEs and VIEs' subsidiaries | (100,160,207) | (13,721,893) | (69,628,327) | (320,543,213)
Net income/(loss) before income taxes | 91,731,395 | 12,567,149 | 39,133,539 | (361,964,123)
Net income/(loss) attributable to Qudian Inc.'s shareholders | 91,731,395 | 12,567,149 | 39,133,539 | (361,964,123)
Foreign currency translation adjustment | 37,882,398 | 5,189,867 | 21,829,283 | 13,036,988
Total comprehensive income/(loss) attributable to Qudian Inc.'s shareholders | ¥ 129,613,793 | $ 17,757,016 | ¥ 60,962,822 | ¥ (348,927,135)

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