The invention relates to the technical field of air pressure switches and discloses an air-pressure switch assembling machine. The assembling device comprises a bending assembly, a bending reinforcingassembly and a tin soldering assembly. The bending assembly comprises a positioning block and a positioning groove formed in the positioning block. Two oppositely arranged grooves are formed in the bottom surface of the positioning groove. Pushing rods and first driving pieces for driving the pushing rods to move are arranged on the two corresponding sides of the positioning groove. The pushing rods correspond to the grooves in a one-to-one mode. The bending reinforcing assembly comprises a pressing block and a second driving piece for driving the pressing block to move. The tin soldering assembly comprises a soldering bit and a tin outlet pipe. The bending reinforcing assembly and the tin soldering assembly are connected through a conveying assembly. By the adoption of the scheme, the air pressure switch assembling machine which is high in automation degree and high in percent of pass is provided.