The invention belongs to the field of wave energy power generation, and particularly relates to a wall-mounted heaving floater type wave energy power generation device. The wall-mounted heaving floater type wave energy power generation device mainly comprises an energy capturing mechanism, a supporting structure, a power output system and the like; the energy capturing mechanism is composed of a floater, sliding mechanisms and connecting parts, is a moving part of the device and is used for capturing wave energy; the supporting structure is of a frame structure, is composed of a supporting beam, a guiding mechanism and damping springs and is used for supporting main parts of the device and limiting and guiding movement of the energy capturing mechanism; and the power output system is composed of a work doing mechanism and an energy converting mechanism and used for converting the wave energy captured by the floater into pressure energy for energy storage, driving a power generator to generate power under the set condition and converting the wave energy into electric energy. The device can be installed on the heading wall face of a floating type platform, a breakwater and a coast, the energy conversion efficiency is high, the starting performance is good, the environmental adaptability is high, the structure is simple, construction and marine installation and maintenance are convenient, and the production and construction cost is low.