Marine cable harness protection device

A marine cable harness protection device disclosed by the present invention comprises a closed junction box, a plurality of first protection tubes and a plurality of first sealing members, each first protection tube has a first end and a second end, the first ends of all the first protection tubes are respectively communicated with the junction box and form a plurality of cable channels extending along different directions so as to branch a cable harness, and the second ends of all the first protection tubes are communicated with the junction box. The second end of the first protection tube is detachably provided with an end cover, the end cover blocks a tube opening of the first protection tube, the end cover is provided with a first wire hole for a cable to penetrate out, and the first sealing piece is arranged on the end cover and used for sleeving the cable in a sealing mode and blocking the first wire hole. Through the detachable end cover and the first sealing element which blocks the first opening of t