The utility model provides an experiment terminal needle, includes and carries the cap by what engineering plastics made, carry upper arm that the cap is U type structure and this U type structure and be good at the terminal trip that sets up up of underarm, upper arm and setting of underarm average level and underarm, the upper arm tip of carrying the cap sets up the regulation portion that connects, it includes still that insulated terminals connects and the metal needle, the metal needle sets up perpendicularly, just the upper end of metal needle with insulated terminals connects turn -on connection back as an organic whole, the metal needle lower extreme by connector regulation portion wears out. The utility model discloses simple structure uses swiftly, can promote the connection speed by a wide margin, reduce the wrong and safe risk among the the connection process, improves the work efficiency of relay protection operation.