The utility model provides a portable reinforcing bar preflex machine solves present reinforcing bar preflex machine larger, the difficult problem that moves and be difficult for carrying, and its technical scheme is, including the counter-force support,"mountain"that the counter-force support was placed for the level appears, and counter-force support rigidity is greater than the rigidity of to be processing reinforcing bar, and the counter-force support includes horizontal sill bar, and the sill bar both ends are equipped with vertical bracing piece, sill bar mid point department is connected with vertical connecting seat, and the connecting seat is connected with handheld pole, and the junction with the connecting seat on the handheld pole is equipped with horizontal, penetrating perforation, and it is located the top of two bracing pieces to perforate, and the top of perforation inner wall is equipped with the ejector pin, ejector pin and the sliding connection of handheld pole department who corresponds, and the ejector pin is connected with the manual type pneumatic cylinder, the utility model discloses a volume is less, easy operation is convenient, the cost is low, reinforcing bar preflex angel position control accurate, can save the labour cost in a large number, the less reinforcing bar preflex operation place in space-rated, and the tool operation advantage is more obvious.