The invention belongs to the technical field of architecture and relates to an upper-clamping and lower-ejection type connecting piece. The connecting piece comprises a connecting sleeve. A connecting plate provided with a connecting hole is arranged at the top of the connecting sleeve. An ejection rod is in screw joint with the bottom of the connecting sleeve. The connecting part further comprises a clamping connection rod, and the end of the clamping connection rod is matched with the connecting hole in shape. After the end of the clamping connection rod is inserted into the connecting sleeve through the connecting hole and the clamping connection rod is rotated, the end of the clamping connection rod can be blocked through the connecting plate, so that the end of the clamping connection rod is prevented from being disengaged from the connecting hole. The ejection rod can be in screw joint in the connecting sleeve, and the end of the ejection rod can abut against the end, located inside the connecting sleeve, of the clamping connection rod. The upper-clamping and lower-ejection type connecting piece can be used for connecting two objects, the connecting part is convenient to assemble, the connection is convenient and fast, and firmness and reliability are achieved after the connection.