Tensioner manufacturer a steel belt tensioner, comprising: tensioner body and tensioning handle, the front end of the tensioner body is provided with a cutting device, the cutting device is fixedly connected to the tensioner body, the cutting device is also provided with a cutting device for operating the handle of the cutting device, the handle of the cutting device is fixedly connected to the cutting device, the middle part of the tensioner body is provided with a band fixing slot, the middle part of the tensioner body A tensioning gear set in the inner said cavity and said with fixing slot coaxial with said tensioning gear and movably connected to said tensioner body by bearings, said pair of symmetrical handle fixing plates set on both sides of said tensioning gear. Said handle fixing plate is fixedly connected to the tensioner body, the top of any handle fixing plate is movably connected to the tensioning handle by bolts, and the bottom o the tensioning handle is engaged with the tensioning gear, the right side of the central strapping fixing slot of the tensioning body is also provided with a belt support bracket, the belt support bracket is identically connected to the tensioner body, and the outer edge of the belt support body is provided with a pressure belt slot for pressing the strapping. Pressure belt belt bracket is connected with movable belt, pressure belt groove is provided with pressure belt groove handle on one side, tensioner hook for lifting pressure belt groove, pressure belt groove handle is fixedly connected with pressure belt groove tensioner body is the bottom of the middle position, the bottom of the right end is provided with non-slip support plate respectively, any non-slip support plate is fixedly connected with the tensioner body. Band fixing slot consists of four segments of the same size. The top of the tensioning handle is provided with a non-slip sleeve. The material of the anti-slip sleeve is rubber.