The invention discloses a clamp used for testing a radar TR (transmitter-receiver) component. The clamp comprises a mounting base (1), four groups of component compacting devices (2) and an adapter connector plug-in mechanism (3); the mounting base comprises a clamp base plate (101), a centrifugal fan (102), a straight-tooth heat radiator (103) and a mounting locating plate (104); the straight-tooth heat radiator is arranged on the clamp base plate; the centrifugal fan is arranged on the clamp base plate and is located at one side of the straight-tooth heat radiator; the mounting locating plate is arranged on the straight-tooth heat radiator; the four groups of compacting devices are arranged at both sides of the mounting locating plate on the mounting base; and the connector plug-in mechanism is arranged on the clamp base plate in the mounting base. By driving the an adapter connector to move along the axial direction of a ball screw by a ball screw pair, the connection and the separation of the adapter connector and the component are overcome, and the problem that the adapter connector and the component cannot be directly plugged-in by manpower because of high joint and connection power between the adapter connector and the component is solved.