The invention discloses a computer fan securing mechanism. The securing mechanism comprises a fixed seat, the two sides of the fixed seat top are symmetrically provided with a bracket, the bracket is a hollow structure, a fixed rod is arranged on the bottom of the inner wall of the bracket, a fixed block is arranged flexibly in a sleeving mode on the fixed rod, a first conduit is arranged on the fixed block, and the fixed rod is arranged flexibly on the first channel, a reset spring is arranged flexibly in a sleeving mode on the fixed rod, one end of the reset spring is welded on the fixed block, and the end of the reset spring away from fixed block is welded on the bottom of the inner wall of the bracket, the fixed block is provided with a clamping block, and the clamping block extends to the outside of the bracket, the bracket is provided with a second channel, and the clamping block is flexibly arranged inside the second channel, the top of the clamping block is provided with a pull ring, a positioning block is arranged symmetrically on both sides of the fixed rod. The computer fan securing mechanism is simple in structure, and convenient to operate, the computer fan is ensured to work normally, maintenance costs are saved and people's demands are met.