The invention discloses a steel-plastic geo-grid network connecting device. The steel-plastic geo-grid network connecting device consists of a shell body, bolts, clamping sheet rooms, insertion holes,clamping sheet slots, a communication slot, slide slots, clamping sheets, engaged teeth, pull plates, slide slots and geo-grid joints. According to the steel-plastic geo-grid network connecting device disclosed by the invention, the clamping sheets and the clamping sheet slots are arranged inside the connecting device, so that lap joint between adjacent two steel-plastic geo-grid networks is changed into connection between grid belts, integrity and continuity of the lap joint part of the geo-grid are greatly improved, and a phenomenon that the grid belts are damaged by pulling as a result ofrelatively great concentrated stress is avoided, and therefore, reinforcing quality of a soil layer and engineering safety are improved.