The utility model relates to a power supply field, especially an utilize setting of street lamp case to fill electric pile's power supply unit. The utility model discloses an invention aim at: problem to prior art exists provides an utilize setting of street lamp case to fill electric pile's power supply unit. Unnecessary electric quantity when saving mains supply in advance through the battery under the power system blackouts condition, in time for the load power supply, improves the user and resists the power failure ability. The utility model discloses well treater for control mains supply state and the battery energy storage condition, and according to mains supply state and battery energy storage condition control low tension switchgear break -make, and then supply power for the load through mains supply circuit and/or tank, when the controller detects the load and needs the electric quantity to exceed the power supply quantity of electric wire netting and/or battery, controller cutting -off part load work.