The invention discloses a connection method for wire connectors without the phenomena of rusting and open circuit. The connection method comprises the following steps of (1) removing an oxide layer on the surface of each wire connector, and straightening each wire connector; (2) heating and melting tin to form a tin liquid; (3) immersing the wire connectors into the tin liquid one by one, and rapidly taking out the wire connectors so that the surfaces of the wire connectors are pasted with a tin layer; (4) removing an oxide layer on the surface of a metal bunched wire, and straightening the metal bunched wire; (5) folding all wire connectors immersed with the tin liquid, winding the wire connectors with the metal bunched wire, and tightly binding the wire connectors to form a wire connector bundle; (6) immersing the wire connector bundle after being tightened in the tin liquid, maintaining the immersion for 50-120 seconds, taking out the wire connector bundle and cooling the wire connector bundle to a room temperature; and (7) binding and covering the wire connector bundle with an insulation tape. The connection method disclosed by the invention has the advantages of simplicity in operation, rapid connection and high connection effect, the wire connector is prevented from being rusted after being oxidized in long-term use, and the hidden danger problems such as power failure and electric leakage caused by open circuit are avoided.