The utility model discloses a special operation machineshop car of electric power measurement superelevation anticollision alarm device, it includes substitutional resistance R00 and R01, voltage stabilizing circuit, infrared receiving circuit, phase -locked loop audio frequency decoding circuit and monostable timing circuit, the the vehicle mounted power of operation machineshop car inserts voltage stabilizing circuit's input after substitutional resistance R00 and R01 partial pressure, voltage stabilizing circuit's the infrared receiving circuit's of output termination input, infrared receiving circuit's output termination phase -locked loop audio frequency decoding circuit's input, phase -locked loop audio frequency decoding circuit with monostable timing circuit is connected, infrared receiving circuit installs in operation machineshop car top. The operation machineshop car operation barrier of in -process of marcing can be responded to to this device, in case have the risk of collision and inform through alarm signal immediately and vehicle operation people avoid the barrier, guarantees the vehicle safety traffic.