The utility model relates to a three -dimensional geogrid of big rigidity has, characterized by constitutes the major structure by grid muscle area, the node of moulding plastics, grid muscle area interconnect is the cube structure, grid muscle area comprises excel in polyethylene and the wash port of the carbon steel wire that excels in, outer parcel, constitute through the node of moulding plastics between the grid muscle area, the node of moulding plastics has been established to mould plastics and has been pressed the hole, presses pore pair grid muscle area junction through moulding plastics and adopts the ultrasonic bonding method to consolidate. This structure has an intensity height, and advantage that rigidity is big can be applicable to slope engineering or subgrade engineering, the reinforcement function of better this structure of performance.