The invention provides an entrance/exit vehicle passing method, device and system. The method comprises the following steps: obtaining and recognizing number plate and RFID card information; if the number plate recognition result and RFID card recognition results are obtained within a preset period, judging whether the number plate recognition result is unmatched with all RIFD card recognition results or not, if the result is negative, controlling the gateway to be in an open state, if the result is positive, recording a first abnormal event, saving the image of the number plate, controlling the gateway to be in an open state at the same time; if only the number plate recognition result is obtained within a preset period, judging the vehicle is a temporary vehicle, controlling the gateway to be in an open state; if no number plate recognition result is obtained within a preset period, detecting the vehicle, if a vehicle is detected, recording a second abnormal event, controlling the gateway to be in an open state at the same time, and if no vehicle is detected, controlling the gateway to be in a closed state. The provided method, device and system increase the passing speed of vehicles in the entrance/exit. The flat-rate vehicles and temporary vehicles can pass the same entrance/exit, the resource waste is reduced, and the traffic safety in the entrance/exit is guaranteed.