A pedestrian walkway guardrail steel reinforcement processing mold device is disclosed, comprising a bracket, a height adjusting support, a positioning block, a reversible positioning slot rod, a longitudinal positioning rod, a transverse positioning rod, and a pressure plate. The device uses a semicircular hole fixed in a corner steel to position the steel bars to achieve the effect of forming the steel bars. It is possible to position and lift the device while positioning the end and side of the steel bars. The positioning slot rod is hinged with the frame, the positioning block is pressed on the frame, and the positioning slot is rotated and the positioning block is moved after the steel bars are tied to achieve the positioning and fixing of the embedded steel bars. It is simple in structure, low in cost, strong in operational applicability, safe and reliable, and suitable for steel reinforcement of pedestrian walkway guardrail of railway box girders.