Vehicle washing system for departure vehicles

A departure vehicle washing system belongs to the technical field of port vehicle washing and comprises a washing mechanism and a barrier gate, the barrier gate is arranged at a vehicle exit of the washing mechanism, the washing mechanism and the barrier gate are both connected with a control mechanism, the washing mechanism comprises a support, a photoelectric sensor is arranged on the inner side of the support, and a sliding rail is fixedly installed at the top of the support. The sliding rail extends in the vehicle advancing direction, a first crown block and a second crown block are installed at the two ends of the sliding rail correspondingly, a cleaning assembly is connected to the bottom of the first crown block, a drying assembly is connected to the bottom of the second crown block, and a radar is fixedly installed on the side, away from the support, of the barrier gate. The control mechanism comprises a control unit for sequentially controlling the first crown block, the second crown block and the ba