The invention relates to a grid circle automatic cutting method and the equipment, the method includes the following steps that: a fabric sleeves on a level main axle, the rotation or the stop of the main axle or is driven by a servo motor; an ultrasonic welding cutting tool and a cutting tool are arranged on an identical vertical linear guide, and are respectively arranged above and underneath the main axle, the ultrasonic welding cutting tool moves above the main axle along the main axle axis line driven by another servo motor and a ball screw nut, simultaneously, the ultrasonic welding cutting tool can reciprocate in the vertical direction along the linear guide under an air cylinder, the cutting tool can reciprocate in the vertical direction along the linear guide controlled by another air cylinder. The invention solves disadvantages produced by that two working procedures are carried on simultaneously. Moreover, the ultrasonic welding avoids some negative influences caused by that the fusing temperature is too high or too low, so that the problem of the grid circle rocking is fundamentally solved.