Submarine cable and land cable connecting device and connecting method thereof

The invention discloses a submarine cable and land cable connecting device and a connecting method thereof. The connecting device comprises a cover plate, a housing, long bolts, fiber-fusing discs, a cone base and a land cable clamp. One surface of the cover plate is a plane, and the other surface is provided with a circular recess area and a circular groove with the centre being an original point; the housing is matched with the cover plate in shape; the opening end of the housing is provided with a circular ring edge, and the cylindrical surface thereof is provided with a plurality of hollow circular cylinders; one hollow circular cylinder is fixedly connected with a submarine cable through the cone base; an inner cone and an outer cone are arranged between the submarine cable and the cone base; the other hollow circular cylinder is fixedly connected with a land cable through the land cable clamp; the housing is internally provided with a plurality of fiber-fusing discs; and the fiber-fusing discs are fixed through the long bolts. The device can effectively clamp armoured steel wires to enable the submarine cable not to separate or break under fierce pulling force; and the combination of the land cable clamp and a clamping piece can provide a clamp force to enable the land cable not to be pulled out under large instant pulling force.