The invention relates to a trepang catching device which comprises a driving device and the like. The driving device comprises storage batteries, an
underwater motor control switch and an
underwater motor which are electrically connected in sequence. The driving device further comprises a
propeller arranged at the rear end of a floating body, wherein the shaft of the
propeller is connected with the output shaft of the
underwater motor, the floating body is arranged on a floating
body frame, and a monitor is connected onto the floating
body frame. A
rope is connected onto the floating
body frame, an anchor body is connected with the
rope, and the lower end of the middle of the floating body frame is connected with a foot stepping frame. An inlet is formed in the upper end of a trepang cage, an elastic blocking strip is arranged on the inlet, and the trepang cage is connected onto the floating body frame through a trepang cage lifting
rope. One end of a mechanical claw return spring is connected with the rear end of the foot stepping frame, the other end of the mechanical claw return spring is connected with the middle of a manual control mechanical claw, a rod portion of the manual control mechanical claw penetrates through the floating body frame, a
handle connected with the upper end of the rod portion extends out the upper end of the floating body frame, a clamping claw connected with the lower end of the rod portion extends out of the bottom end of the floating body frame, and an underwater camera is arranged on the front side of the manual control mechanical claw.