The invention relates to a parking lot ETC payment system, belongs to the technical field of parking lot vehicle management control, and solves the technical problems of low passing efficiency, easy congestion, difficult management and the like in traditional parking lot manual charging. According to the technical scheme, the parking lot ETC payment system comprises a vehicle detection device, a camera module, a microwave read-write device, a lane control machine, a barrier gate, a parking lot management system, a settlement fee deduction system and a user device, wherein the microwave read-write device is 5.8 G DSRC microwave read-write equipment, the vehicle detection device is a ground induction coil detector, and the user device integrates ETC card payment means and is compatible withWeChat payment, Alipay, parking APP or cash payment means of a user. According to the invention, the problems of safety and convenience of vehicle management can be effectively solved, good passing experience is provided for users, and particularly, the users can truly experience that the users get on high speed, get off parking lots, get in scenic spots, get back to communities, do not wait for along time and walk smoothly.