The invention discloses cutting scissors for costume designing. The cutting scissors for costume designing comprise a tailoring table, a tailoring mechanism fixedly installed at the top of the tailoring table through a supporting frame and a control cabinet fixedly installed on one side of the supporting frame, a square groove is formed in the side, located on the supporting frame and away from the control cabinet, on the tailoring table, a sliding groove is formed in the bottom, located in the groove, on the tailoring table, a positioning plate is arranged inside the groove, a sliding block which is in sliding fit with the sliding groove is arranged at the bottom of the positioning plate, an air pumping hole is formed in the positioning plate, a negative pressure pump is fixedly installedat the portion, located on the side wall of the positioning plate, inside the groove through a fixing plate, and is connected with the air pumping hole through a negative pressure pipe, and a negative pressure cavity is formed inside the positioning plate. The cutting scissors are high in automatic degree, time and labor are saved, cutting path offsetting can be effectively avoided, stable cutting of a garment fabric is achieved, the cutting quality and personal safety are guaranteed, and tailoring efficiency is high.