The utility model belongs to the technical field of weaving equipment technique and specifically relates to that relate to is automatic cropping device. The utility model discloses automatic croppingdevice includes batching seat, master control set to and locate the batching seat cloth roller structure, cropping structure, lead fabric swatch and little telescoping cylinder, overall structure is simple, the routine maintenance of being convenient for. The support arm that is the form of buckling in the cropping structure can drive the cloth roller back -and -forth movement under the control ofcropping telescoping cylinder, be convenient for on the transport means of yardage roll removal outside the equipment of weaving, it can accomplish the back and brake and tailor the yardage roll, itscropping of being convenient for weaving to cut the cloth structure simultaneously. Whole cropping operation process is accomplished by master control set control is automatic, effectively solves manual work's difficulties and problems, and the operating efficiency is high moreover.