The utility model discloses a sectional type mold for a prefabricated floor slab. The formwork comprises a middle edge formwork body and an end edge formwork body, the end edge formwork body is fixedly connected with the end of the middle edge formwork body, the end edge formwork body and the middle edge formwork body are located on the same straight line, the end edge formwork body is provided with a first lap joint part for fixing reinforcing steel bars, and the middle edge formwork body is provided with a second lap joint part for fixing reinforcing steel bars. A plurality of middle edge templates and end edge templates are adopted in the sectioning mold, the middle edge templates are connected end to end to be spliced into a long-strip-shaped structure with the set length, and the endedge templates are fixed to the two ends of the middle edge templates. A first lap joint part for fixing a reinforcing steel bar is arranged on the end part edge template; the second lap joint parts for fixing the reinforcing steel bars are arranged on the middle side formworks, the middle side formworks can be repeatedly used in the using process, when the end formworks are not suitable for use,only the end formworks of the set model need to be replaced, the using flexibility is improved, the repeated utilization rate of the mold is increased, and the using cost is reduced.