The invention discloses a wear-resistant prism gasket for a telescope. The formula of the wear-resistant prism gasket for the telescope comprises the following raw materials in parts by weight: 60 to80 parts of natural rubber, 25 to 35 parts of polyvinyl chloride resin, 15 to 25 parts of chloroprene rubber, 12 to 16 parts of metal powder, 8 to 10 parts of carbon black, 8 to 10 parts of fiber powder, 5 to 7 parts of polyamide, 5 to 7 parts of zinc sulfate, 3 to 5 parts of an anti-ageing agent, 3 to 5 parts of a wear-resistant agent, 2 to 4 parts of a flame retardant and 2 to 4 parts of a vulcanizing agent. The invention further discloses a preparation process of the wear-resistant prism gasket for the telescope. The wear resistance of the wear-resistant prism gasket can be effectively enhanced, the anti-pressure capability of the wear-resistant prism gasket can be improved; the preparation process is simple, practical, safe, reliable and suitable for large-scale popularization.