Auxiliary supporting mechanism for engine cylinder block rough machining jig

The utility model discloses an auxiliary supporting mechanism for an engine cylinder block rough machining jig. The auxiliary supporting mechanism comprises a supporting rod supporting an engine cylinder block, the supporting rod applies acting force upwards vertically relative to the engine cylinder block, and the supporting rod is fixedly connected to the engine cylinder block rough machining jig through a connection portion. The connection portion comprises a sliding sleeve and a compression spring, the sliding sleeve is fixedly connected to the engine cylinder block rough machining jig, the compression spring is arranged on the side, away from the engine cylinder block, in the sliding sleeve, and the supporting rod is in sliding connection with the sliding sleeve and makes contact with the compression spring. By the adoption of the technical scheme, the number of supporting points for the engine cylinder block is increased, and machining stability of the engine cylinder block is improved.