The vertical iron chip crusher has the functions of main shaft monitoring and foreign matter ejection. When foreign matter enters the crusher and causes the main shaft to jam, the control system will send a signal to cut off the source input. The active shaft of the crusher will automatically reverse and eject the foreign matter. The active shaft of the metal crusher completes the ejection of foreign through the set jamming procedure, and the foreign matter ejection port is automatically closed. It the metal crusher exceeds the set jamming frequency, the metal chip crusher will automatically stop and alarm.