The invention provides a work roller bending device for a plate and strip rolling mill. The work roller bending device for the plate and strip rolling mill comprises an upper work roller bending device and a lower work roller bending device which are connected in an up-down manner; the upper work roller bending device comprises an upper roller bending oil cylinder; a cylinder body of the upper roller bending oil cylinder can move up and down along an upper guiding block arranged on the waist portion of a memorial archway; the bottom of the cylinder body of the upper roller bending oil cylinder is provided with a piston rod of the upper roller bending oil cylinder in a penetrating manner from bottom to top; the lower work roller bending device comprises a lower roller bending oil cylinder; the bottom end of the piston rod of the upper roller bending oil cylinder is fixed to the top end of a cylinder body of the lower roller bending oil cylinder; a lower guiding block is arranged in the cylinder body of the lower roller bending oil cylinder; the bottom of the cylinder body of the lower roller bending oil cylinder is provided with a piston rod of the lower roller bending oil cylinder in a penetrating manner from bottom to top; and the bottom of the piston rod of the lower roller bending oil cylinder is fixedly connected with the lower guiding block. The work roller bending device for the plate and strip rolling mill is provided with a guiding mechanism, the running stability of the device is effectively guaranteed, it is avoided that the oil cylinders bear lateral force, the oil leakage problem of the oil cylinders is fundamentally solved, and an effect of controlling the plate type better is achieved.