The invention comprises: a central controller (PLC), whose input end is connected to each sensor and whose output is used to control the electric actuator, used for transmitting the real-time working state to the man-machine interface a signal collecting and converting system used for measuring and converting the signals outputted from each sensor and transmitting them to the central controller. The electric actuator includes a stepping motor linked with the lock gate of the snow removing vehicle and used for receiving the signal from PLC the man-machine interaction system includes a touch screen and is connected to the central control the controlling program containing a control algorithm is saved in the central controller the spreading amount of the thaw agent is controlled by the height of the lifted gate.