The utility model relates to a ground simulation measuring device for formation pressure while drilling. The ground simulation measuring device for formation pressure while drilling is characterized in that a rock core is arranged in a pressure testing cylinder; a formation pressure injection hole is formed on one of flange plates at both ends of the pressure testing cylinder, and the input end of the formation pressure injection hole is connected to a formation pressure injection device; an annular mud pressure injection port is formed on the other flange plate, the input end of the annular mud pressure injection port is connected to a mud injection device, a thrust rod penetrates the center of the flange plate, and a thrust piston in a thrust oil cylinder is connected at the other end of the thrust rod; a suction channel penetrates the thrust rod, one end of the suction channel is communicated in the pressure testing cylinder, a probe is arranged on the suction channel, and the other end of the suction channel penetrates the thrust rod to be connected with a suction pressure testing device; a thrust oil cylinder pressure inlet is formed on the thrust oil cylinder at the sealed end of the thrust piston, and a reverse thrust oil cylinder pressure inlet is formed on the thrust oil cylinder at the piston rod end of the thrust piston; and the input ends of both the thrust oil cylinder pressure inlet and the reverse thrust oil cylinder pressure inlet are connected to a thrust pressure device.