The present invention discloses a power grid energy conservation and loss reduction control method considering reactive response capability of a charging pile. the features of a charging pile taken as a reactive resource and the reactive voltage-regulation principle are analyzed, a reactive voltage optimization model considering the day-ahead optimal scheduling and the intra-day optimal correction is putted forward, according to the mathematic model, the day-ahead optimal scheduling employs a traditional parallel capacitor set and an on-load voltage regulation transformer to reduce transmission losses, and the reactive support of the electric car charging pile is employed to reduce the transmission losses when the intra-day abnormal operation; and a time-sequence progressive reactive control scheme based on the reactive voltage sensitivity is provided, and the reactive response capacity of the electric car is employed to perform reactive optimization correction. The power grid energy conservation and loss reduction control method considering the reactive response capability of the charging pile realizes the reactive local compensation and continuous regulation and reduces the active loss of the power grid.