In this test, 216 cement-based grouting test blocks with 3 different test models and 6 different ages were made using uniform raw materials, mixing ratios, and curing conditions. The compressive strength was measured under the same loading conditions. The effects of different test models on the early compressive strength of cement-based grout test blocks and the conversion coefficients of compressive strength under different test models were studied at six different ages. The conversion coefficients of early compressive strength of the standard test block with the size of 40 mm×40 mm×160 mm prism and the non-standard test block with the size of 150mm×150mm×150mm under standard curing conditions are obtained, and the conversion coefficients of early compressive strength of the standard test block with the size of 100 mm×100 mm×100 mm cube and the non-standard test block with the size of 150 mm×150 mm×150 mm under the standard curing conditions of the Class IV cement-based grout are obtained. The change rule of each early strength conversion coefficient was analyzed, and the conversion coefficient was obtained which can be used as a reference for practical engineering application.