Building energy-saving ventilation mechanism

The utility model discloses a building energy-saving ventilation mechanism, and relates to the technical field of ventilation structures. The building energy-saving ventilation mechanism comprises a pipe body, a frame is slidably connected to the inner wall of the pipe body, a filter screen is slidably connected to the inner wall of the frame, a through hole is formed in the inner wall of the bottom end of the pipe body, a cylinder is fixedly connected to the inner wall of the pipe body, and a pressing plate is rotatably connected to the outer wall of the cylinder; the outer wall of the pressing plate is elastically connected with an embedded block through a first spring, a fan is fixedly connected to the inner wall of the pipe body, and a connecting column is rotationally connected to the inner wall of the pipe body. When the filter screen is used, the right end of the pressing plate is pressed inwards, the pressing plate rotates around a cylinder, the left end of the pressing plate pulls out the embedded bl