Composite floor slab and construction method for connecting composite floor slab with steel reinforced concrete beam

The invention discloses a composite floor slab and a construction method for connecting the composite floor slab with a steel reinforced concrete beam, a plurality of receding grooves are formed in at least one side of a prefabricated slab, and the receding grooves penetrate through the two side plate surfaces and the end surfaces of the prefabricated slab, so that a plurality of bosses which are alternately distributed with the receding grooves are formed at the two ends of the prefabricated slab; and the slab bottom load-bearing steel bars extend out of the end parts of the bosses to form the horizontal reinforcing bars. The receding grooves are formed in the end of the composite floor slab, so that when the composite floor slab is installed, one end of the composite floor slab can avoid blocking of stirrups, the end of the composite floor slab can be inserted into a steel reinforced concrete beam deeply, a certain distance is reserved for horizontal reinforcing bars at the other end of the composite floor