Abstract: The present invention provides a terminal electrical connector, which includes a terminal unit and a rotating cap. The terminal unit includes a terminal unit body, one or a plurality of electrical terminals provided inside the terminal unit body, and a torsion spring positioned on the terminal unit body. A limiting groove for limiting a pivotal stroke and a first positioning groove for positioning a first end of the torsion spring are provided on an outer peripheral side of the terminal unit body. The rotating cap includes a cap body, and one or a plurality of locking blocks provided on the cap body for locking on another terminal electrical connector. A sliding block and a second positioning groove are provided on an inner circumference of the cap body. The sliding block is used for limiting the pivotal stroke of the rotating cap relative to the terminal unit body, and the torsion spring is used for inertially returning the rotating cap to a position of a reset angle relative to the terminal unit body.