The utility model provides a reinforced concrete floor slab upper strata reinforcing steel bar positioning device, press roof beam and right location by the left side location of controlling relativeparallel arrangement to press the roof beam, set up perpendicularly in left side location press roof beam and right side location press between the roof beam several supplementary depression bar and respectively the symmetry set up in left side location press roof beam and right side location press the roof beam under between four parts of several fixed support base of bottom surface each other welded connection or piece together each other take to be connected and constitute the rectangular who wholly is the square body structure of inside fretwork and personally experience sth. Part of the body, the left location of this square body structure's the rectangular body is pressed and is linked for the integrated into one piece structure through the supplementary depression bar of several between roof beam and the right location pressure roof beam. The utility model discloses an upper strata rebar positioning is accurate to the floor, reaches the purpose of guaranteeing floor effective cross -sectional area size, simultaneously can also regard as the constructor passageway, avoid personnel to trample at will and cause floor slab rebar to warp the personal safety of shifting and havingguaranteed the staff, but reuse realize the environmental protection, the effectual efficiency that improves the construction.