The utility model relates to coal mine underground supporting equipment, in particular to an along-groove stepping split type advanced hydraulic support frame group which solves the problems of existing along-groove advanced supporting which is high in working intensity of workers, high in supporting cost, unsatisfactory in supporting effect and the like. The support frame group comprises two sets of support bodies, and the support bodies are arranged in parallel and with the same structures. Each support body comprises at least three support frames which respectively are a front-placed support frame, a middle-placed support frame and a rear-placed support frame from front to rear, each support frame comprises a base seat, a top beam, stand columns and a four bar mechanism, two ends of the top beam of the middle-placed support frame are respectively provided with a hinge top beam, two ends of the base seat of the middle-placed support frame are respectively provided with a hinge base seat, and the four stand columns of the middle-placed support frame are supported between the top beam and the base seat, the hinge top beam and the hinge base seat. The base seats of the front-placed support frame, the middle-placed support frame and the rear-placed support frame of each support body are connected through pulling-moving oil cylinders between support frames, and the top beams and the base seats of adjacent two sets of support frames are connected through anti-lodging adjusting oil cylinders. Self-moving of advanced supporting frames is achieved, frame moving speed is improved, supporting procedures are simplified, working intensity of workers is reduced, and high-productivity and high efficiency of fully-mechanized coal mining platform planes are improved.