A stable and reliable electrical connection mechanism. A plug of the electrical connection mechanism includes a plug shell, and a plug insulator and a contact pin which are arranged in the plug shell; a socket includes a socket shell, a nut connected on the front end of the socket shell, and a socket insulator arranged in the socket shell and the nut, insertion holes are arranged on the socket insulator, and internal threads are arranged on the nut; the plug shell is externally sleeved by a check ring, the front end of an outer wall of the check ring is provided with a snap ring, and the rear end is provided with connection threads; the snap ring and the check ring are coaxial; and the check ring and the snap ring can be clamped in the nut. According to the electrical connection mechanism, the front end of the check ring of the plug is not provided with external threads but is only provided with the snap ring, and in installation, a user only needs to push the check ring into the nut easily, clamp the snap ring in the rear end of the nut, and then turn the nut and the socket by one to two rounds, so that the rear end of the check ring is in threaded connection with the front end of the nut and thus the plug and the socket can be firmly fixed. Compared with a conventional thread connector, the electrical connection mechanism provided by the embodiment is extremely small in required number of winding, and has the advantages of stable connection and fast installation speed.