Unattended self-service payment system for parking lot

The invention discloses an unattended self-service payment system for a parking lot, and the system comprises a barrier gate charging part which comprises an entrance barrier gate part and an exit barrier gate part, and the entrance barrier gate part carries out the photographing, recognition and registration of vehicles entering a garage on the ground one by one; the exit barrier gate part is used for carrying out vehicle identification and comparison on vehicles on an exit lane on the ground, and guiding payment and rod lifting for release; the mobile toll collection part comprises a lane sliding part and a mobile identification toll collection part, the lane sliding part is arranged on the ground and drives the mobile identification toll collection part arranged on the lane sliding part to carry out license plate identification analysis on a non-first vehicle, and a driver is guided to complete toll collection work; and the payment information is transmitted to the exit barrier gate piece to directly lift