The invention discloses a receiving end power grid low-frequency emergency control method, a main station and a storage medium. The method comprises the steps that according to the acquired loss powerof a direct current control protection system and the real-time frequency of a receiving end power grid, corresponding emergency control measures are matched from a preset control strategy table, including enabling a wind turbine emergency power support mode and enabling a direct current emergency power support mode; for the wind turbine emergency power support mode, the emergency power support distribution value of each wind farm execution station is determined according to the wind farm measurement and control information uploaded by each wind farm collection station in real time; and for the direct current emergency power support mode, the emergency power support distribution value of each direct current control and protection system in the receiving end power grid is determined according to the operation information of a non-fault direct current control and protection system, the emergency power support shortage after wind turbine emergency power support, and the real-time frequency of the receiving end power grid. According to the invention, low frequency in the receiving end power grid can be effectively suppressed.