The present invention disclose a wall top fixing device for easy installation and disassembly, which has a frame and a clamping member arranged on the frame, the frame is provided with at least one hollow foot post with column wall, the column wall is longitudinally provided with a spiral lifting chute passing through the column wall, and the clamping member passes through the spiral lifting chute and is movably sleeves in the hollow foot post, the clamping member has a foot buckle out side of the spiral lifting chute, the clamping member is rotated so that the clamping member is spirally fall down until that the foot buckle forms a clamping state with the frame.