The invention discloses a hydraulic valve casting mold of a large loader. The hydraulic valve casting mold comprises an upper shell mould, a lower shell mould, a sand core and a gating-feeding system.The sand core comprises a core head, a main core and small cores. The main core is composed of seven longitudinal core bars and four transverse core bars, wherein the longitudinal core bars and the transverse core bars are arranged in the same plane. Multiple convex blocks are arranged on the main core, mounting grooves are formed in the convex blocks, and the small cores and the main core are fixed through the mounting grooves. The gating-feeding system comprises two heating insulated feeders with the diameter being 90 mm and the height being 120 mm. The hydraulic valve casting mold has theadvantages that the structure is reasonable and compact, reliability is high, and assembling and casting are convenient; the straightness of a main valve hole casting blank is controlled to be smallerthan 0.8 mm; the assembling error of a complex sand core is avoided; the casting defects of casting hole shrinkage, shrinkage porosity, inner air holes and the like are overcome; the compactness of the inner structure is improved; leakage is avoided in the high-pressure work state that the rated pressure is larger than or equal to 35 Mpa; the percent of pass of casting is greatly improved; and the casting cost is reduced.