The invention belongs to the technical field of environment-friendly equipment and relates to an anti-shrinking device, in particular to a self-stitching and anti-shrinking device. The device comprises a sewing machine, a cloth storage frame and a programmable logic controller (PLC); the sewing machine is located on one side of the cloth storage frame; a first encoder is arranged on the sewing machine; an input roller and an output roller are arranged on two sides of the cloth storage frame; a servo motor is arranged on the input roller; a second encoder is arranged on the output roller; a floating roller is arranged between the input roller and the output roller and is arranged on the cloth storage frame; a third encoder is arranged on the floating roller; and the first encoder, the servo motor, the second encoder and the third encoder are connected with the PLC. The device is simple in structure and reasonable in design, continuous production, timely breakage and shrinking prevention of filter bags can be realized, the requirement for continuous production of filter materials with different formulas can be met, the working efficiency can be effectively improved, and the labor intensity of workers can be reduced.