Small vacuum inflating pump

The utility model discloses a small vacuum inflating pump. Direct current on an automobile serves as power to inflate automobile tires, and under the conditions that an automobile engine cannot supply vacuum due to faults, the small vacuum inflating pump can temporarily replace an engine to perform vacuum pumping so as to guarantee good braking in the towing process. An inflating pump 3 coupled with a direct current motor is arranged on a negative pressure chamber 1, and four magnets 12 are arranged below the negative pressure chamber 1 to land. An air outlet of the inflating pump 3 is provided with a connecting hose 14 to be used for inflating the tires, an air inlet of the inflating pump 3 is provided with an air inlet pipe to be connected with the inside of the negative pressure chamber 1, and a solenoid valve 6 is used for closing and opening an air inlet pipe channel of the inflating pump. A manual two-positioning three-way valve 4 is arranged on the negative pressure chamber 1, one port of the manual tw