The invention relates to a mooring device of a shoal water floating type platform. The mooring device comprises mooring cables, water drums and anchoring chains, wherein draw-works are separately arranged at two lateral ends of a bow of the floating type platform and two lateral ends of a stern of the floating type platform; the water drums are separately arranged on the longitudinal outer side of the bow of the floating type platform and the longitudinal outer side of the stern of the floating type platform; each of the extending ends of the mooring cables which are wound on the draw-works at the two lateral ends of the bow of the floating type platform is connected with the corresponding water drum on the outer side of the bow of the floating type platform, and each of the extending ends of the mooring cables which are wound on the draw-works arranged at the two lateral ends of the stern of the floating type platform is connected with the corresponding water drum on the outer side of the stern of the floating type platform; and the two water drums are separately fixed on a seafloor anchor base through the anchoring chains. The invention further discloses a dual-water-drum mooring manner when the floating type platform is under a normal operation state, a single-water-drum mooring manner when the floating type platform is under a survival working state, and a mooring method for shifting the two mooring manners according to the sea condition. According to the mooring device disclosed by the invention, the positioning requirements for the shoal water floating type platform under the situation of mooring alongside can be met, the security requirements for the shoal water floating type platform under an anti-typhoon mooring mode can be met, a ship is convenient to moor laterally and alongside, and the mooring device has high stormy wave resistant capacity.