The invention discloses a protection method for avoiding collision of a cutting head. The protection method comprises the following steps that firstly, the side of the cutting head is provided with asensor, and the sensor is in communication connection with a servo motor driving the cutting head; secondly, the maximum movement speed of the cutting head is acquired, the maximum response delay timeof the servo motor is acquired, and the minimum sensing safety distance of the sensor is worked out according to a following formula; and thirdly, the sensor is started and detects a barrier in frontof the cutting head when the cutting head moves. According to the protection method for avoiding collision of the cutting head, by means of the arrangement of the first step, the second step and thethird step, the purpose that the cutting head is provided with the sensor, then, the servo motor is stopped in time after the senor senses the barrier, and the problem that the cutting head collides with the barrier and consequently the cutting head is damaged is avoided can be effectively achieved.