Detection and early warning system for vehicle in tank

The utility model relates to a detection and early warning system, in particular to a detection and early warning system for a vehicle in a tank. The system comprises a wireless control unit which comprises a PLC controller, a wireless receiving device and an alarm unit, the PLC controller receives a sensor signal through a wireless communication unit, and the alarm unit receives a control signal of the PLC controller; the sensor detection unit is in wireless communication with the wireless receiving device and is used for detecting the position and environment information of the car arrester; and the control switch circuit receives a control signal of the PLC controller and executes a switching action. In the process that a mine car enters a tank, when it is detected that a car arrester in the tank is not closed in place or a car arrester reset detection device in the tank breaks down, a fault alarm is given out immediately, and the automatic operation mode of the elevator is locked. And accidents caused by