The invention relates to an energy-saving optimizing control device for a substation and a method. Embedded arrangement is adopted. The device comprises a PIC QQ2013 single chip, a radio frequency chip, a storage chip, a relay module, a power interface, a lithium battery module and a power conversion module, wherein the PIC QQ2013 single chip is respectively connected with the radio frequency chip, the storage chip, the relay module and the lithium battery module; the lithium battery module is connected with the power conversion module; the power interface is respectively connected with the power conversion module and the relay module. The energy-saving optimizing control device for the substation can reasonably adjust the running of the energy-consuming equipment and guarantee the excellent running environment in the substation by collecting the voltage data of the energy-consuming equipment, receiving an energy-saving optimizing instruction through a wireless sensing network and controlling the switching operation of a cooler, an electric heating mechanism, an air conditioner and an electric radiator; the energy consumption of the substation and the exhaust gas discharging are reduced; the energy is saved; the efficiency of energy utilization of the energy-consuming equipment, such as, air conditioner, and the like, is optimized; the energy consumption and the operation cost are reduced.