The utility model discloses a clamping device for testing a moving contact of a railway signal electrodeless relay. The clamping device comprises a connecting block, a clamping block and a clamping piece arranged in the clamping block, wherein the connecting block and the clamping block are in screw joint fit; the clamping block is a cuboid, and a groove is formed in the clamping block; the connecting block is in an inverted-L shape, a connecting column is arranged on the upper portion of the connecting block, and a threading hole is formed in the middle of the connecting column. Each clampingpiece comprises a fixing part, a supporting part, a clamping part and an elastic part which are integrally arranged; the fixed part is matched with the groove and provided with a fixed bolt hole, thesupporting part is connected with the fixed part and the clamping part, the clamping part is a plane matched with the movable contact, and the elastic part is located below the clamping part and is semicircular. The device is simple in structure, convenient and fast to clamp and install, reliable in clamping effect and good in matching effect with an existing testing device, and the problem thatthe question mark type movable contact cannot be matched with the existing testing device due to the large size and the special shape is effectively solved.