Teaching system for machine tool troubleshooting

The invention relates to a teaching system for machine tool troubleshooting, which comprises a trouble setting board, a troubleshooting board, a PLC (programmable logic controller) and a plurality of specific relays, wherein the trouble setting board, the troubleshooting board and the plurality of specific relays are electrically connected with the PLC, and the plurality of specific relays are connected to a plurality of specific trouble presetting points in a machine tool circuit respectively. According to the teaching system for machine tool troubleshooting, the plurality of specific relays are connected to the specific trouble presetting points in the machine tool circuit respectively; when the specific trouble presetting point is cut off, a circuit of the specific trouble presetting point is disconnected, and setting of a trouble point is completed; and when the specific trouble presetting point is connected, the circuit of the specific trouble presetting point is connected, and troubleshooting of the trouble point is completed. A teacher can randomly select and set the trouble point through the trouble setting board, and students carry out troubleshooting through the troubleshooting board, the operation amount in troubleshooting teaching is small, the teaching efficiency is high, and troubleshooting materials are not required. Wires are not contacted directly in the whole troubleshooting process, thereby being high in security, and having small damages for equipment.