Anti-electric shock pre-warning device for lazy arm of crane

The utility model relates to an anti-electric shock pre-warning device for a lazy arm of a crane. The anti-electric shock pre-warning device comprises a detection device and an alarm device, wherein the detection device comprises an electric field detector, an analogue-to-digital converter, a distance detector, a first controller and a wireless communication transmitter; the output end of the electric field detector is connected with the first input end of the first controller through the analogue-to-digital converter; the output end of the distance detector is connected with the second input end of the first controller; the wireless communication transmitter is connected with the serial port output end of the first controller; the alarm device comprises a wireless communication receiver, a second controller and an alarm module; the wireless communication transmitter is connected with the wireless signal receiver through a wireless signal; the output end of the wireless communication receiver is connected with the serial port input end of the second controller; and the output end of the second controller is connected with the control end of the alarm module. The anti-electric shock pre-warning device is capable of preventing the lazy arm of the crane from colliding with an electrified body, so that the possibility of electric shock of constructors is reduced.