Coupling loss adjustable leaky coaxial cable and use method thereof

The invention discloses a coupling loss adjustable leaky coaxial cable and a use method thereof, the leaky coaxial cable comprises an inner conductor, an insulator, an outer conductor and a sheath, the outer conductor is provided with a slotted hole, a hollow cavity is formed between the sheath and the outer conductor except the slotted hole, the center of the hollow cavity is provided with a convex block in sliding fit with the sheath, and the convex block is provided with a through hole. Two metal sheets which are symmetrically distributed in a splayed mode are hinged to the bottom, located in the sheath, of the protruding block, a boss is arranged on the portion, corresponding to the slotted hole of the outer conductor, of the sheath, the face, right opposite to the slotted hole, of the boss is in an arc shape bent towards the sheath, and the free ends of the two metal sheets make contact with the edge of the bottom of the protruding block. A plurality of fins are distributed on the upper surfaces of the t