The invention provides a manufacturing method of a safety device of a rubber cutting machine. The manufacturing method comprises the following steps that A. two cuboid boxes are selected and placed on the ground in parallel to be manufactured into roller path frames, and a roller path motor is welded and fixed to the outer side of one roller path frame; B. stand columns are fixedly installed at the upper portions of the roller path frames, fixing cutter sliding rails are welded and fixed to the inner walls of the stand columns, cutters are installed in the cutter sliding rails, a rack is welded and fixed to the tops of the stand columns, the upper end of the rack and the outer wall of the middle of an oil cylinder are welded and fixed, a hydraulic rod is arranged in the oil cylinder, induction heads are arranged at the lower portions of the cutter sliding rails on the inner sides of the stand columns, and the signal output ends of the induction heads are electrically connected with an electric control system; C. an oil tank is arranged on the ground one on one side of one roller path frame, and the electric control system is installed at the upper portion of the oil tank. The manufacturing method is simple, and a manufactured product is simple in structure and reasonable in structural design. When an object exceeds the set safety distance, the downward cutters can stop moving, the operation step is standardized, and the personal safety of operators is guaranteed.