The invention discloses a hoop type concrete pouring formwork system for plugging a hole gap of a through floor pipeline, and the problems of poor stability and inconvenient installation and disassembly of an existing pipeline gap blocking formwork system are solved. A left side formwork (4) and a right side formwork (5) are respectively arranged on the lower bottom surface of a floor slab (1), and a left semi-cylindrical hoop (6) is fixedly connected to the lower bottom surface at a left semicircular notch of the left side formwork (4); and a right semi-cylindrical hoop (7) is fixedly connected to the lower bottom surface at a right semicircular notch of the right side formwork (5), the left semi-cylindrical hoop (6) and the right semi-cylindrical hoop (7) are connected to the outer sidewall of a wearing floor pipeline (3) in a hooped manner after being subjected to butt joint, and the hoops are fixed through two hoop hooping lead screws. The method is suitable for blocking a hole gap of a thicker floor slab, the stable formwork supporting system can support the weight of large pouring concrete, pouring is achieved at a time, the quality is good, and in particular, the assemblingand disassembling operation is simple and easy to achieve.