The invention relates to an improved solder strip annealing furnace. The improved solder strip annealing furnace comprises a furnace body. The furnace body comprises guiding-in pipes and guiding-out pipes, wherein the guiding-in pipes and the guiding-out pipes are symmetrically arranged on the outer wall of the furnace body and communicate with the interior of the furnace body. Conveying belts are arranged between the guiding-in pipes located on one side of the furnace body and the guiding-out pipes which are located on the other side of the furnace body and correspond to the guiding-in pipes. Safety covers are arranged outside the conveying belts. Air holes are formed in the safety covers. A protective gas input pipe is arranged at the upper end of the furnace body. A heating pipe is arranged at the bottom of the furnace body. The improved solder strip annealing furnace has the advantages that the conveying belts are arranged between the guiding-in pipes and the guiding-out pipes, and the direction of machined materials can be guided; the safety covers are arranged on the conveying belts so that overflowing of the machined materials can be prevented; and circulating penetration of hot air can be facilitated through the air holes in the safety covers.