Secondary sudden stop device of crane

The utility model relates to a secondary emergency stop device of a crane, which comprises a power distribution box for controlling the crane, an intermediate relay KM1, a power supply cut-off receiver and a remote control transmitter capable of being in paired communication connection with the power supply cut-off receiver, the intermediate relay KM1 is provided with a normally closed switch K1, and the main contactor is arranged in the power distribution box. A controller and an intermediate relay KM2 controlled by the controller are arranged in the power cut-off receiver, the intermediate relay KM2 is provided with a normally closed switch K2, a coil of the main contactor is connected with the normally closed switch K1 in series to form a circuit I, a coil of the intermediate relay KM1 is connected with the normally closed switch K2 in series to form a circuit II, and the circuit I and the circuit II are connected between power lines in parallel. According to the utility model, when the crane is out of ord