To systematically study the effects of fly ash content, silica fume content and curing temperature on the mechanical properties of wet shotcrete, the range and variance analysis of the compressive strength of wet shotcrete were carried out by designing orthogonal tests. The results show that the compressive strength of wet shotcrete increases with the increase of curing age, but the increase rate slows down with the extension of curing ages. The compressive strength of wet shotcrete can be effectively improved by the increase content of silica fume and pulverized coal, but when the content of fly ash exceeds 10% (mass fraction, the same below), the increase of fly ash content has no significant influence on the later compressive strength of concrete. The order of the influence of the three factors on the compressive strength of wet shotcrete is silica fume content＞curing temperature＞fly ash content. The sensitivity of the compressive strength of wet shotcrete to mineral admixtures is positively correlated with the curing temperature. The improvement effect of mineral admixtures on compressive strength of wet shotcrete increases with the increase of curing temperature. With the increase of curing temperature, a large number of flocculent cementitious substances are generated. The hydration products bond more densely, and the compressive strength and bearing performance of concrete are further enhanced. The established multiple nonlinear models can predict the compressive strength of concrete, and wet shotcrete has the best compressive strength when the silica fume content, fly ash content and curing temperature are 15%, 15% and 10 ℃, respectively.