The invention relates to a fluid kinetic energy collecting device for electricity generation. The fluid kinetic energy collecting device for electricity generation adopts concept -reciprocating movement coupled with rotating movement to collect energy. The fluid kinetic energy collecting device comprises a single fluid kinetic energy collecting wall, or at least two adjacent kinetic energy collecting wall devices in the length direction, wherein each kinetic energy wall comprises one or two fixing frames adopting a specific quadrangular shape; a sliding frame of which the shape is matched with the shape of the corresponding fixing frame is arranged in the corresponding fixing frame; each sliding frame can horizontally slide from left to right along the upper end and the lower end of the corresponding fixing frame, and other directions of each sliding frame are fixed; a plurality of blades which are uprightly arrayed are arranged in each sliding frame; and under the effect of fluid force, the blades drive the sliding frames to move from left to right, and drive a generator to work. According to the fluid kinetic energy collecting device disclosed by the invention, the mechanism which is totally different from almost all conventional electricity generating devices which are operated or researched and developed brings enormous benefits unattainable by a conventional rotating turbine for the utilization of renewable resources including wind energy, river current energy, wave energy, tide energy and the like, and chances are directly provided for conveniently developing the renewable energy sources.