The invention provides a two-pump control circuit of a sewage pump. The two-pump control circuit of the sewage pump controls two sets of draining pump units; each set of draining pump unit is provided with a liquid level switch, and each liquid level switch is provided with different control liquid levels; when water in a machine room reaches a first liquid level height, a first unit is operated; when the water in the machine room reaches a second liquid level height, the first unit and the second unit are operated at the same time, and three sets of water pumps and three corresponding liquid level switches can be provided; when the water reaches a higher third height, three water pumps are operated at the same time; and so on. The number of the water pumps needing to be started can be automatically controlled according to the water height in the machine room. The problem of only operating one set of water pump unit in the prior art can be effectively solved; when the machine room generates slight water leakage, one draining pump is operated; and when the machine room generates bad water leakage, and the water level is higher, multiple draining pumps can be operated at the same time.