The utility model belongs to the fields of mining engineering and safe technology, and in particular relates to a water-rich sand stratum high-pressure grouting testing device which is used for solving the problems of test and validation of action principle and effect of the prior art of high-pressure grouting to water-rich loose sand layer in the stratum underground or on a ground. The technical scheme adopted in the utility model is as follows: the water-rich sand stratum high-pressure grouting testing device comprises a sand cylinder and a water injecting tank, wherein the upper end of the sand cylinder is provided with an opening; the sand cylinder and the water injecting tank are connected by a water injecting pipe; a grouting pipe of which one end protrudes outside is arranged in the sand cylinder; a sand cylinder mortar outlet hole is arranged on the cylinder arm of the sand cylinder; a grouting pipe mortar outlet hole is arranged on the grouting pipe; the upper end of the sand cylinder is provided with a sealing film; the sealing film is closely connected to the upper arm end of the sand cylinder by a garter spring; a pressurizing pad is arranged on the sealing film; organic glass is adopted as the material of the sand cylinder.