The invention belongs to the fields of electronic materials and adhesives, and relates to a preparation method of a PPTC adhesive used for a printed wiring board. The preparation method is simple in process and low in cost, the PPTC adhesive prepared by using the method is short in curing time, the PPTC adhesive is used for conductive adhesion of an electronic element I/O end on the wiring board,and an overcurrent and over-temperature effect is achieved. The area of the wiring board can be effectively saved, the manufacturing cost is reduced, the technical cycle is shortened, and the device circuit reliability can be improved.