The invention relates to the technical field of an accessory device of an electrical connection device, in particular to a drop-proof waterproof socket plug, which improves the firmness of insertion of the plug and the socket, avoids poor contact and ignition, and improves practicability. And improve its waterproofing performance to avoid electric leakage; Include a socket body, plug body, Retaining cover and retaining sleeve, the top end of the socket body is provided with a plug slot, and a plug block is arranged inside the plug groove, A plug hole is arranged on the plug block, the bottom end of the plug body is provided with a plug post matched with the plug hole, the bottom of the plug body is located in the fixing sleeve, the top of the plug body is located in the fixing cover, and the top part of the plug body is in close contact with the inner side wall of the fixing cover, the bottom part of the inner side wall of the fixing sleeve is provided with an internal thread structure, the top part of the side wall of the socket body is provided with an external thread structure, the top part of the inner side wall of the insertion groove is provided with an annular sealing groove, and the outer side bottom part of the plug body is provided with a rubber sealing ring.