The invention provides offshore hydroelectric power generation equipment. By the aid of the offshore hydroelectric power generation equipment, technical problems in the aspect of converting wave energy and tidal current energy into electric energy by the aid of the same equipment can be solved, and the power generation efficiency can be improved. The offshore hydroelectric power generation equipment comprises a platform mechanism, wave energy power generation systems and a tidal current energy power generation system. The wave energy power generation systems are mounted on two sides of the platform mechanism, and the tidal current energy power generation system is rotatably mounted at the bottom of the platform mechanism; the platform mechanism comprises a platform frame, an air chamber and mooring anchors, the wave energy power generation systems comprise power generation mechanisms and energy storage mechanisms, the tidal current energy power generation system comprises a tidal current energy capturing mechanism, a tidal current energy power generation mechanism and a tidal current energy power generation case, the tidal current energy capturing mechanism comprises a water turbine and a flow guide cover, the water turbine is mounted in the flow guide cover, a guide pipe is fixedly arranged on the upper portion of the flow guide cover, and the upper end of the guide pipe is connected with a turntable. The offshore hydroelectric power generation equipment has the advantages that energy in a wave energy form and a tidal current energy form can be sufficiently utilized by the aid of the offshore hydroelectric power generation equipment, and the power generation efficiency can be improved.