The invention discloses a silkworm cocoon drying device comprising case bodies. Each case body is provided with a case cover; the case wall of the case body is formed by an inner wall and an outer wall; a heat conduction port is formed on the upper part of the outer wall of the case body; a plurality of downwardly inclining heat conduction pipes are arranged on the inner wall of the case body; vertical upward heat conduction pipes are arranged on the inner wall of the bottom of the case body; a plurality of slantwise arranged screens are disposed in the case body; the screens are arranged from top to down in a zigzag shape; long holes, through which silkworm cocoons can fall off are formed on the lower parts of all the screens expect for the bottommost screen; and the lowest end of the bottommost screen is provided with a silkworm cocoon outlet. By the use of the silkworm cocoon drying device, a problem of uneven heating of the present silkworm cocoon drying device can be solved.