The invention provides a magnetic-attracting-type positioning ground shaft of a side-hung door. The magnetic-attracting-type positioning ground shaft comprises a ground shaft body, a speed reduction fork, hydraulic cylinders, a speed reduction fork side face magnetic block, a rotary shaft side face positioning magnetic block, a rotary shaft, a positioning block, a shell and a large decorative cover, and is characterized in that positioning grooves are formed in the ground shaft body, and positioning screw holes are formed in the positioning grooves; an inner cavity is further formed in the ground shaft body, a rotary shaft positioning ring, a rotary shaft positioning hole and a circular table are arranged in the inner cavity, and a positioning adjusting bolt is arranged beside the ground shaft body; the speed reduction fork is provided with a front end fork entry, a fork tail and a speed reduction fork raised head, and a speed reduction fork limiting nail limits the fork tail onto thecircular table; the hydraulic cylinders are fixed to the two sides of the ground shaft body, piston shafts on the hydraulic cylinders are connected together through a connecting disc, and the two endsof an oil pipe are connected with the two hydraulic cylinders correspondingly; and a hydraulic oil flowing speed adjusting valve is arranged on the oil pipe. When the side-hung door is closed, the speed can be reduced, the closing position is accurate, and opening is also easier.