The present invention discloses a distributed memory powergrid system construction method. The method specifically comprises the following steps: (1) building a memory power grid resource model, i.e. enabling modeling of a memory power grid resource to follow the public information model specification in the IEC61970 standard, and constructing the tree-type memory power grid resource model by using package, inheritance and object application oriented to an object; (2) determining a memory storage structure, i.e. storing all attribute data of the resource in an array manner, and determining positions of the attribute data in an array by defining a mapping relationship between attribute name identifiers and array subscripts so as to realize data access; (3) horizontally splitting power grid resource data; (4) loading and caching the power grid resource data; (5) synchronizing memory power grid data; (6) determining a memory power grid section; and (7) determining a memory power grid access interface. According to the method provided by the present invention, data transmission between distributed nodes can be reduced to the greatest degree when resource access and calculation are implemented, thereby greatly increasing efficiency.