The invention relates to a pop-up mounting device for a soil pressure gauge. The pop-up mounting device comprises a pair of support plates arranged oppositely, wherein a rotating shaft is connected between the support plates; a driving lever which can freely rotate in a plane parallel to the support plate is hinged to the rotating shaft; the lever bodies, above and below the rotating shaft, of the driving lever are reversely hinged to a first soil pressure gauge push rod and a second soil pressure gauge push rod; one ends, far away from the driving lever, of the first and second soil pressure gauge push rods are connected with soil pressure gauges; two ends of the driving lever are connected with a first spring and a second spring which are respectively arranged in the same direction with the first or second soil pressure gauge push rod; the first and second springs from traction pre-tightening to the driving lever after stretching; a clamping slot for holding a bayonet lock for limiting the driving lever is arranged in the support plate; a traction rope is connected with the bayonet lock; when the bayonet lock is pulled out of the clamping slot by the traction rope, the first and second spring contract, the driving lever is pulled by the first and second springs to push the first and second soil pressure gauge push rods to move.