Column bottom structure of full-field ground pile net composite foundation of transformer substation

The invention discloses a column bottom structure of a transformer substation full-field ground pile net composite foundation, which comprises an under-column independent base arranged at the column bottom of a concrete column; a raft; wherein a geogrid layer is arranged between the under-column independent base and the raft plate; wherein an anchor bolt connecting assembly penetrating through the geogrid layer is connected between the under-column independent base and the raft plate, and the two ends of the anchor bolt connecting assembly are embedded in the under-column independent base and the raft plate respectively. By additionally arranging the under-column independent base, the situation that the geogrid layer is damaged by the concrete columns, and consequently the whole ground pile net composite foundation is locally fractured is avoided, and therefore the complete whole ground pile net composite foundation is formed, the scheme can effectively and evenly disperse building loads to a plurality of sup