Air inlet and exhaust self-switching type two-stage air pump

The invention relates to an air inlet and exhaust self-switching type two-stage air pump. The air pump comprises a distribution valve and an air storage tank which are communicated with the air inlet end and the exhaust end of the air pump respectively. The distribution valve comprises a first valve seat and a second valve seat which are arranged in parallel, a two-position four-way valve is arranged on the first valve seat, a two-position two-way valve A and a two-position two-way valve B are arranged on the second valve seat, and the two-position four-way valve, the two-position two-way valve A and the two-position two-way valve B are electrically connected with a vehicle control mechanism respectively and used for switching and adjusting gas circuits. According to the air inlet and exhaust self-switching type two-stage air pump, the split type design is adopted, maintenance and replacement are easier, and the replacement cost is low; and the flow channel switching function is achieved, and multiple air sup