The invention provides a motor axle core detection device which can effectively and accurately carry out detection screening of motor axle cores. The motor axle core detection device comprises a frame. The frame is provided with a feeding pipe and a material distributing cylinder. The material distributing cylinder is provided with a material distributing arm. One end of the material distributing arm is connected with the material distributing cylinder, and a feeding platform is arranged under the other end of the material distributing arm. A position clamp vertical block is internally provided with a discharging pipe. The top end of the discharging pipe is connected with the lower end of a transparent pipe, and the upper end of the transparent pipe passes through the feeding platform and is connected with a material conveying port. An industrial camera is positioned at one side of the transparent pipe, and the other side of the transparent pipe is provided with a backlight. A material blocking cylinder is connected with a position clamp baffle plate. The position clamp baffle plate is matched with the position clamp vertical block. A discharging rack is arranged under the position clamp vertical block. A discharging rack is connected with a discharging cylinder. The discharging rack is also provided with a positive material pipe and a reverse material pipe. The motor axle core detection device can effectively detect the motor axle core, is high in precision and fast in speed, greatly improves the efficiency of positioning the motor axle core, and screens out axle cores that meet follow-up processing position requirements.