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Document And Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Sep. 13, 2022
Jun. 30, 2021
Document Information Line Items      
Entity Registrant Name SMART POWERR CORP.    
Trading Symbol CREG    
Document Type 10-K    
Current Fiscal Year End Date --12-31    
Entity Common Stock, Shares Outstanding   7,358,052  
Entity Public Float     $ 26.5
Amendment Flag false    
Entity Central Index Key 0000721693    
Entity Current Reporting Status No    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity Well-known Seasoned Issuer No    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
ICFR Auditor Attestation Flag false    
Document Annual Report true    
Document Transition Report false    
Entity File Number 000-12536    
Entity Incorporation, State or Country Code NV    
Entity Tax Identification Number 90-0093373    
Entity Address, Address Line One Rong Cheng Yun Gu Building Keji 3rd Road    
Entity Address, Address Line Two Yanta District    
Entity Address, City or Town Xi An City    
Entity Address, Address Line Three Shaan Xi Province    
Entity Address, Country CN    
Entity Address, Postal Zip Code 710075    
City Area Code (011)    
Local Phone Number 86-29-8765-1098    
Title of 12(b) Security Common Stock, $0.001 par value    
Security Exchange Name NASDAQ    
Entity Interactive Data Current No    
Auditor Name Paris Kreit & Chiu, CPA’s LLP    
Auditor Location Los Angeles, California    
Auditor Firm ID 6651