The inner wall of inner and outer stranded wires is sprayed with emery to increase damping effect. Due to large contact area, uniform stress distribution and no stress concentration, it has good protection effect on optical cable; the grip strength of optical cable can reach more than 95% RIS of optical cable, fully meeting the needs of optical cable erection; the selected materials have strong corrosion resistance and aging resistance, simple structure, convenient installation, no special tools and maintenance free.