A trough-type graphite boat, which includes a number of W-shaped two-way inclined grooves with two opposite groove surfaces and bottom supporting protrusions, a bottom surface, an upper end surface, an inner side, an outer side and a stop opposite to the upper end surface. The two groove surfaces are respectively designed with at least one exhaust slot, and an edge protection groove is designed at the intersection of the bottom support protrusion and the two opposite groove surfaces. The bottom surface is designed with a through groove parallel to the W-shaped two-way chute and with an approximate Λ-shaped cross-sectional shape at the lower part of the protrusion formed by any two adjacent W-shaped two-way chute. The utility model enables the long-shaped cemented carbide sheet products to be degummed evenly during the hydrogen degumming and vacuum sintering processes, thereby avoiding product warpage and deformation, and the product has a large loading capacity and less consumables.