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Condensed financial information of the parent company - Condensed statements of comprehensive income/(loss) (Details)
 12 Months Ended
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)