Automatic reaming machine

The utility model provides an automatic reaming machine. The automatic reaming machine comprises a rack (1) and further comprises a controller (2), an air cylinder (3) and a motor (4), wherein an output shaft of the motor is provided with a reamer (5); a piston rod of the air cylinder is provided with a positioning seat (6); the positioning seat (6) is molded with a positioning lug boss (6.1); the positioning seat (6) is also provided with a limiting block (6.2); the positioning seat (6) is further provided with a sensor (7) which is used for sensing an aluminum freezing motor enclosure and is clamped and positioned on the positioning seat (6); the piston rod of the air cylinder, the positioning seat (6), the output shaft of the motor and the reamer (6) are coaxially arranged; the air cylinder (3), the motor (4) and the sensor (7) are electrically connected with the controller (2). The automatic reaming machine is high in automation degree, rapid in reaming speed, high in efficiency, high in reaming quality and relative low in cost.