Auxiliary supporting and positioning clamp

The invention relates to the technical field of part tools, in particular to an auxiliary supporting and positioning clamp which can achieve quick clamping of parts, guarantee reliable positioning and fixing of the parts and improve the machining efficiency and quality and comprises a base, and a supporting and positioning device and a fixing device are installed on the base. The supporting and positioning device comprises a middle supporting and positioning mechanism and a side supporting and positioning mechanism, the side supporting and positioning mechanism comprises side contact bolts connected with side supporting cylinders on the two sides, and the middle supporting and positioning mechanism comprises a middle positioning seat, a lower contact bolt and a lower positioning plate, the lower contact bolt and the lower positioning plate are both connected with a lower supporting cylinder, a transverse supporting mandrel is installed on the middle positioning seat, one end of the transverse supporting mandr