The invention relates to the field of integrated circuit, and provides a priority asynchronization arbitration tree circuit which is capable of automatically switching. The asychronization arbitration is used for achieving a fair arbitration mechanism, making each request signal be fairly received and responded and fairly obtaining the use right of a bus. Therefore, according to the technical scheme, the priority automatic switchover arbitration unit is adopted in the asynchronization arbitration tree unit, a tree shape arbitration structure altogether comprises N arbitration hierarchies, the arbitration hierarchies are from low to high, there are altogether 2N requesting input ports, 2N responding output ports and 2N-1 priority automatic switchover arbitration units. The priority asynchronization arbitration tree circuit which is capable of automatically switching is mainly applied to occasions of integrated circuit design and manufacture.