The invention discloses an air-pressure control self-adapting air valve. The air valve comprises a through-flow tube and a magnetic assembly, the magnetic assembly comprises a first magnetic block anda second magnetic block which are oppositely arranged and have the magnetic attraction force between the first magnetic block and the second magnetic block, a first control assembly is arranged on the through-flow tube, the first control assembly comprises a first rotating valve plate and a first fixed rotating shaft, the first rotating valve plate is arranged in the through-flow tube, the firstrotating valve plate is connected with the first fixed rotating shaft, the first magnetic block is arranged on the first fixed rotating shaft, and the magnetic attraction force center of the first magnetic block is arranged on the side of the first fixed rotating shaft. Due to the fact that the magnetic attraction force is inversely proportional to a separate clearance, the effects that the open and close force of the air valve is large when a throttle is small, and the open and close force of the air valve is small when the throttle is large can be achieved. The air valve can meet the actualuse requirements very well.