Downhole clutch device

The invention discloses a downhole clutch device, and belongs to the technical field of downhole tools for oil and gas drilling and production. The downhole clutch device comprises an outer cylinder and a mandrel. The outer cylinder rotatably sleeves the mandrel, an inner circulation liquid path mechanism is arranged between the outer cylinder and the mandrel, and the internal circulation liquid path mechanism can be driven to generate liquid inner circulation motion through rotation of the mandrel; the internal circulation liquid path mechanism is provided with a valve unit capable of conducting/cutting off the internal circulation liquid path mechanism; when the valve unit conducts the internal circulation liquid path mechanism and the mandrel rotates, the mandrel drives the internal circulation liquid path mechanism to generate liquid internal circulation motion, and the mandrel rotates relative to the outer cylinder. When the valve unit cuts off the internal circulation liquid pathmechanism and the mandre