The invention relates to cleaning techniques. A combined type cleaning technique for a water supply pipeline comprises the following steps that firstly, a combined type pipeline cleaning machine and the water pipeline to be cleaned are connected, the water pipeline to be cleaned is provided with a main water inlet and at least two branch outlets, a main water valve is arranged on the main water inlet, each branch outlet is provided with a faucet, the faucet on any branch outlet is connected with a pulse outlet, gas is delivered into the water pipeline to be cleaned through the combined type pipeline cleaning machine after the main water valve is closed, and then leakage detection is conducted; secondly, the gas in the water pipeline to be cleaned is completely exhausted; thirdly, sterilization liquid is delivered into the water pipeline to be cleaned through the combined type pipeline cleaning machine; fourthly, the sterilization liquid in the water pipeline to be cleaned is completely discharged; and fifthly, high-pressure gas is delivered into the water pipeline to be cleaned through the combined type pipeline cleaning machine while the main water valve is opened. According to the combined type cleaning technique for the water supply pipeline, a cleaning way is optimized, and stubborn dirt on the water supply pipeline can be washed away more easily through the combination of the high-pressure gas and water.