The utility model discloses a device of homophase out -phase road surface grooving, the steel mould is fixed in the basic unit on road surface, pave in the steel mould lay respectively behind the concrete one long to tooth's socket template and a weak point to the tooth's socket template, the length is passed through self -tapping screw with the weak point to the surface of tooth's socket template to the tooth's socket template and is connected with the longeron, the both ends of crossbeam are fixed on the steel mould, it is long to the tooth's socket template, it is short in applying paint the isolating agent on tooth's socket template and the steel mould with a brush, the length sets up the gas pocket to tooth's socket template and short upper surface to the tooth's socket template, every construction festival section only needs once the location can form whole tooth's socket during the use, need not to advance line location for every tooth's socket alone, lots of time is saved, very big improvement grooving efficiency, accelerates the construction speed. The tooth's socket quality that forms simultaneously is reliable, and the appearance is pleasing to the eye, and the geometry is accurate, and homoenergetics such as length, width, the degree of depth, interval reach the designing requirement.