Circuit board tin soldering device

The utility model relates to the field of tin soldering equipment, in particular to a circuit board tin soldering device which comprises a conveying belt, a base, a tin soldering assembly, a clamping piece, an air suction piece and a working box. The working box is provided with a base; a conveying belt penetrating through the working box is arranged on the base; the clamping piece is arranged on the conveying belt; the tin soldering assembly is arranged at the upper end of the working box, and the working end capable of moving up and down and left and right faces the conveying belt. The air suction piece is arranged on the working box and matched with the tin soldering assembly. The tin soldering assembly comprises a cross rod, a sliding sleeve, a driving piece, a bearing plate, a first air cylinder, a first motor, a chassis, a cooling piece, a tin soldering piece and a second air cylinder. The material box containing the tin bars is additionally arranged, the tin bars can be controlled to roll out and move