The invention relates to the technical field of a combined flow intercepting well, in particular to a combined flow intercepting well for clearing and flow-dividing. The combined flow intercepting well for clearing and flow-dividing comprises a well body and a photoelectric detecting clearing and flow-dividing device arranged in the well body; the side walls of the well body separately communicatewith a sewage inlet pipe, an intercepting sewage pipe and an overflowing water outlet pipe, wherein the sewage inlet pipe is higher than the intercepting sewage pipe and the overflowing water outletpipe, and the photoelectric detecting clearing and flow-dividing device comprises a control terminal, a first photoelectric probe and an airbag valve, wherein the first photoelectric probe and the airbag valve are electrically connected to the control terminal separately; the first photoelectric probe is disposed in the sewage inlet pipe, the airbag valve comprises an air pump electrically connected to the control terminal, a first airbag and a second airbag, wherein the first airbag and the second airbag are separately connected to the air pump, wherein the first airbag is disposed in the intercepting sewage pipe, the second air bag is disposed in the overflowing water outlet pipe. A photoelectric signal is adopted to directly identify the water quality of the water in the sewage inlet pipe, and higher precision is achieved; and the problem of the sewage overflowing of a traditional intercepting well during flood season can be effectively solved.