The utility model discloses a shiprepair of fortune maintenance that is used for complementary power station of fishing light, including hull, slide rail and cat ladder, the slide rail lay on the hull bottom plate, the one end of cat ladder is equipped with the slider, is equipped with the pulley on the slider, just the cat ladder pass through slider and slide linkage realize the expansion of cat ladder and accomodate, the slider on be equipped with stop device, when the cat ladder expandes the operation, through the position of the fixed cat ladder of stop device, the other end of cat ladder is equipped with the couple. This device on the one hand, through simple and easy flexible cat ladder device can realize overhauing, abluent purpose, with low costs, maneuverability is strong, on the other hand owing to climb the characteristics that ladders has the shrink, is adapted to the liquid level difference of various differences, accomodate the cat ladder through the slide rail, practice thrift the ship inner space, convenient operation, reduce the fortune dimension degree of difficulty in the complementary power station of fishing light, improved work efficiency.