Invar steel wire heat treatment equipment and method

The invention provides invar wire heat treatment equipment and method. The invar steel wire heat treatment equipment comprises a continuous heating furnace, the heating furnace is provided with a hearth which is heated through open fire combustion so as to conduct continuous heat treatment on steel wires, and the portions, on the two opposite sides of the hearth, in the side wall of a furnace body are each internally provided with a smoke guide tunnel. A plurality of heat treatment pipes which penetrate through the front end and the rear end of the furnace body and are used for heating the invar steel wire are arranged in each flue gas diversion tunnel, and the flue gas diversion tunnel in each side wall communicates with the rear end of the hearth, so that high-carbon steel wire high-temperature heat treatment and invar steel wire medium-temperature heat treatment can be carried out at the same time; the temperature gradient difference is designed, waste heat of the steel wire heating furnace body and waste