The invention discloses a power grid control method and device. The method comprises the steps of obtaining first total power of multiple pieces of equipment after receiving connection requests, of requesting connection to a power grid, of the multiple pieces of equipment; judging whether the first total power is greater than maximum instantaneous impact load of the power grid or not; and sequentially connecting the multiple pieces of equipment into the power grid under the condition of judging that the first total power is greater than the maximum instantaneous impact load of the power grid. By the power grid control method and device, the technical problem of great impact to the power grid since high-power equipment is intensively connected to the power grid in the prior art is solved.