The invention provides a technical scheme of an anti-jamming mechanism for side roller lifting of a straightening machine. According to the scheme, the mechanism comprises a supporting roller bearing seat and a pressure bearing head used for being connected with a lifting mechanism of the straightening machine, and the pressure bearing head is located under the supporting roller bearing seat. The mechanism is characterized in that the supporting roller bearing seat is fixedly connected with the pressure bearing head, and the lower surface of the supporting roller bearing seat is closely attached to the upper surface of the pressure bearing head. By using the mechanism, the phenomenon that the lifting of a side roller is jammed on account of the falling of oxide scales is effectively avoided, and the problem that the side roller, a supporting roller and the lifting mechanism are not lifted or dropped synchronously is solved.