The utility model provides a communication tower elevating platform antioverloading switching device, including loading plunger, support column, on -off controller, spring, alarm, elevating platform and fixed plate, the fixed plate both ends are fixed respectively on two communication tower crossbeams, the support column vertical fixation is on the fixed plate, on -off controller fixes on the support column, the loading plunger includes telescoping device and trigger device, the telescoping device wholly is cylindrically, and the telescoping device is embedded into in the spring, the spring obtains to support on the fixed plate, trigger device links to each other with on -off controller, on -off controller is used for the controlled loading plunger to open stopping, alarm and on -off controller link to each other, the telescoping device fixed connection of elevating platform and loading plunger. The utility model discloses simple structure can report to the police when the platform takes place to overload, increases lift platform's safety in utilization, the concurrent operation is simple and convenient, the reciprocating of the elevating platform of being convenient for.