Multi-shaft full-automatic tin soldering device for circuit board

The utility model relates to the technical field of circuit board tin soldering, and discloses a circuit board multi-shaft full-automatic tin soldering device which comprises a base, a rack and a multi-shaft welding mechanical arm, the rack is fixedly arranged at the top of the base, the multi-shaft welding mechanical arm is fixedly installed at the top of the rack, trays are symmetrically and fixedly arranged at the top of the base, and the trays are arranged on the base. A circuit board is arranged in the tray; the base is of a hollow structure, a cooling water pipe is fixedly installed on the inner side wall of the base, the water inlet end and the water outlet end of the cooling water pipe extend out of the base, first air pipes are fixedly arranged at the bottoms of the two trays, a second air pipe is fixedly arranged at the top of the base and located between the two trays, and an air collecting cover is fixedly arranged at the lower end of the second air pipe. And a fan is fixedly mounted in the air co