The invention relates to a stair step antiskid strip forming device. The stair step antiskid strip forming device comprises a connecting rod, wherein the upper end of the connecting rod is fixedly connected with a handle; the lower end of the connecting rod is fixedly connected with a section of fixing channel steel for forming the antiskid strip; a plurality of corresponding forming grooves are formed in the rear side of the bottom surface of the fixing channel steel in parallel; the front sides of the forming grooves respectively communicate with corresponding guide grooves; the channel walls at the two sides of the guide grooves are respectively inclined outwards; a corresponding material scraping groove is formed in the front side of the bottom surface of the fixing channel steel; thefront side of the material scraping groove extends to the front end of the bottom surface of the fixing channel steel; the groove walls on the two sides of the material scraping groove are arc shaped;and the rear side of the material scraping groove communicates with and is connected to one side, disconnecting to the forming grooves, of the guide grooves. According to the stair step antiskid strip forming device, the rapid forming operation of a stair step antiskid strip can be synchronously achieved while the surface finishing of a stair step is carried out.