The invention relates to a processing method of a laser cutting head processing spare part and a processing system of the laser cutting head processing spare part. The method includes steps of step S1, detecting capacitance value between a nozzle of a laser cutting head and the surface of a processing work piece; step S2, transforming the capacitance value to an oscillating frequency signal; stepS3, processing the oscillating frequency signal to obtain the distance value between the nozzle of the laser cutting head and the surface of the processing work piece; step S4, comparing the distancevalue with the prestored distance value in the database; step S5, controlling the movement of the laser cutting head according to the comparative result so as to adjust the distance between the nozzleof the laser cutting head and the surface of the processing surface; step S6, controlling the laser cutting head to move around the setting path so as to complete the processing of the spare part. The automatic calibration of the distance between the laser cutting head and the surface of the processing work piece is carried out, complex operations of manual adjustment are avoided, the adjusting result is more reliable.