The utility model relates to a micro-pressure electric heat storage system, which mainly comprises a micro and normal-pressure boiler. The micro and normal-pressure boiler is divided into two branches through a primary side circulating water pump; one branch is connected with a plate heat exchanger to form a parallel loop; the other branch is connected with the input end of a heat storage tank; the output end of the heat storage tank is connected with the micro and normal-pressure boiler and form an addition loop; and the plate heat exchanger is connected with a heat consuming device through a secondary side circulating water pump and form a loop. The utility model has the following advantages: the heat storage can be fully and completely performed, and the hot water in the whole heat storage tank maintains the consistent temperature after the heat storage is completed. When the user uses the hot water, the heat of the hot water in the tank can be completely released for use. The devices of the whole system are in the state with the micro or normal pressure, thereby ensuring the safety and reliability. Five kinds of operating conditions can be realized to satisfy the requirements of different users and different operating conditions. The operation is simple. In the five kinds of operating conditions, the original electrical load capacity of the user is used to the greatest extent, and the investment increase caused by the capacity increase is minimized.