The invention provides a method for evaluating the voltage support capability of a receiving side power network of a multi-DC feed-in system, belonging to the technical field of power network planningand operation of a power system. Firstly, the voltage, active power, reactive power consumed and phase of bus voltage fed from DC to AC bus are measured after the rated state and current command arechanged respectively. According to the two measurements, the multi-feed equivalent effective short-circuit ratio and the multi-feed critical effective short-circuit ratio of each DC are obtained respectively. The voltage support capability of each HVDC receiver is evaluated by comparing the multi-feed equivalent effective short-circuit ratio with the multi-feed critical effective short-circuit ratio. The invention can accurately evaluate the voltage support capability of the AC power network under the conditions of synchronous variation and asynchronous variation of each DC current in a multi-DC feed system, and can provide reference basis for the planning and construction of a large-scale AC/DC hybrid system.