The invention relates to an aluminum pipe flattening machining device for a refrigerator evaporator, and belongs to the technical field of shrinking and sealing. The aluminum pipe flattening machiningdevice for the refrigerator evaporator comprises a machine box, a U-shaped groove strip and a baffle are arranged in the machine box, and a flattening mould rod is connected to the baffle; a motor and a limiting block are mounted in the machine box, a rocker is connected to the motor, a round buckle is mounted on the rocker, a vertical frame is slidably connected to the round buckle, and a firstpush rod is fixedly connected to the side, away from the motor, of the machine box; two cams are rotatably connected into the machine box, belts are connected between the cams and the motor, a slidinggroove is formed in the machine box, a sliding block is slidably connected into the sliding groove, a second push rod is fixedly connected to one side surface of the sliding block, a supporting rod is fixedly connected to the top surface of the sliding block, a second connecting rod is hinged to the top end of the supporting rod, a vertical rod is hinged to the second connecting rod, and a pressing block is connected to the bottom end of the vertical rod. According to the technical scheme, the problems that specifications of aluminum pipes after flattening are not uniform, the flattening accuracy is poor, the production efficiency is low and the safety performance is poor are solved, the whole structure is simple, and the practicability is high.