The invention discloses a WeChat-platform-based parking space renting method. The method comprises: parking space renting information, a WeChat account number and a license plate number of a parking space owner are obtained; parking space leasing request information, and a WeChat account number and a license plate number of a temporary parking space lessee are obtained; matching is carried out and the information is bound; a license plate number of a vehicle entering a parking lot is identified; the WeChat account number of the temporary parking space lessee is inquired based on the license plate number; whether the WeChat account number of the temporary parking space lessee and the WeChat account number of the parking space owner are stored is determined; if not, the WeChat account number of the temporary parking space lessee is stored and opening is carried out; and a license plate number of a vehicle going out of the parking lot is identified; according to the license plate number, the WeChat account number of the temporary parking space lessee is inquired; paid leasing fees are received; and the WeChat account number of the temporary parking space lessee is received and opening is carried out and the WeChat account number is eliminated. Therefore, the situation of parking space tension is alleviated; the time is saved; and effective management of parking spaces in the parking lot is realized. In addition, the invention also provides a WeChat-platform-based parking space renting system.