The utility model discloses a frock is fixed to pencil, its characterized in that: include: rectangular bottom plate (1) and perpendicular and symmetry set up in both sides board (2) of bottom plate (1) long edge, two the reason that goes up of curb plate (2) evenly is provided with a plurality of otch (3) that are used for holding the pencil, double -phase neighbour be the division board between otch (3), be provided with bed course (4) on the inner wall of division board. The utility model provides a frock is fixed to pencil selfs make empty the bursting at the seams of a waffle slab by oneself and restraints the frock, and empty size, the wiring point position of opening of simulation is fixed with little generating line pencil, simulates binding post position otch simultaneously, carries out the separated time.