The invention provides a testing platform suitable for a relay protection device. The testing platform comprises a protection device region, a testing equipment region and a signal switching control device, wherein the protection device region is used for installing at least one relay protection device to be tested; the testing equipment region is used for installing automatic testing equipment and dynamic simulation equipment and used for being connected with the protection devices; the signal switching control device comprises an air plug connector and an air plug controller connected with the air plug connector, and the air plug connector is used for being connected with all the relay protection devices to be tested. The testing platform is capable of simulating the operation environment of a 110 kv transformer substation system and realizing multifunctional system testing of the relay protection devices, has the advantages of being flexible, reconfigurable, capable of being controlled remotely, easy to operate, movable and small in occupied space and realizes multifunctional system testing and service life testing of the protection devices.