The invention relates to a sealing washer of claw spin-cap. Its manufacturing method show as follow: the raw materials are PVC paste resin and its reshaping accessory ingredient. The described reshaping accessory ingredient includes stabilizer ESBO and calcium stearate, paraffin lubricant, titanium dioxide pigment. It grinds the reshaping accessory ingredient to slurry, and then puts the slurry into a high-speed mixer, and then it adds PVC paste resin as main raw material and calcium carbonate as filling material, then it mixes the mixture with high-speed for 15 to 25 minutes and achieves liquid sealant through filtering. It injects the liquid sealant into the medial side of the cap and forms a thin layered liquid sealant with the high-speed rotating of the cap, and the cape is baked at 180 deg.C +- 10 deg.C for 60 to 90 seconds. Its character is that it adds the secondary raw material PVC resin, DINCH plasticizer and LGFLEX EBN plasticizer before mixing.