Submarine cable lowering device

The utility model belongs to the technical field of cable laying, and particularly relates to a submarine cable lowering device which comprises a frame body and an adjusting assembly installed on the outer surface of the frame body. The adjusting assembly comprises a support fixedly connected to the surface of one side of the frame body, a motor installed on the surface of one side of the support and a sliding block slidably connected to the interior of a sliding groove formed in the surface of one side of the support, a screw rod is adjusted through the motor on the support, and the screw rod pushes the sliding block to slide in the sliding groove formed in the surface of the support. A hydraulic rod pushes a top plate, the top plate drives a clamping plate to firstly clamp the outer side of the cable, the clamping plate drives a guide rod to slide in a sliding groove formed in the surface of a moving block, the friction force of the clamping plate to the cable is increased, and the cable is prevented from b