The invention discloses an ocean engineering equipment marine positioning mooring system, which comprises main winches, a duplex guide chain wheel, auxiliary winches, a moving guide chain wheel and a plurality of chain outlets, wherein the chain outlets are uniformly distributed in the two sides of the front end and the back end of a deck of ocean engineering equipment to be positioned in the shipboard extending direction; the moving guide chain guide realizes the sliding relative to the equipment to be positioned through a horizontal moving mechanism; the whole set of positioning mooring system is provided with at least two main winches according to the structure characteristics of the moored ocean engineering equipment; the main winches are arranged at the front part and the back part of the ocean engineering equipment; the number of the auxiliary winches is identical to the number of the horizontal moving mechanisms; the auxiliary winches are arranged in a position near the horizontal moving mechanisms; in addition, the steel wire rope guide is realized through guide pulleys; the duplex guide chain wheel is arranged in the rope outlet direction of the main winches; the steel wire ropes from the two sides can be gathered and guided onto the main winches. The auxiliary winches are in charge of dragging the main winch steel wire ropes to the position of the main chain opening; finally, the final gathering tensioning is realized through the main winches.