The invention relates to the technical field of protection screens in substations, and further discloses a novel non-return frame type working curtain for a protective screen. The working curtain includes a protective cabinet, symmetrically distributed sliding rails are fixedly mounted on the two sides of the front surface of the protection cabinet respectively; uniformly distributed anti-slidinggrooves are formed in the front surface of the sliding rail, a fixing bolt is movably mounted at the top of the front surface of the sliding rail, a sliding block is embedded in the fixing bolt, one side of the sliding rail is movably connected with one side of a fixing wheel, and the other side of the fixing wheel is fixedly connected with one end of a reel. Through cooperative use of a sliding rail, the anti-sliding grooves, the fixing bolts, the sliding blocks and the fixing wheels, the original arrangement site safety measure time can be shortened by 50%, meanwhile, each non-return frame type working curtain is long in service life and can be repeatedly used, the problems that arrangement of existing safety measures needs arrangement and storage, the working time is long, and efficiency is low are solved, and therefore practicability is improved.