The invention discloses a method for reducing weld cracks of low-cobalt hard alloy. The method is characterized by comprising the steps that a sintering area in a sintering furnace is divided, and thesintering position of the low-cobalt hard alloy is determined; a pressed blank with a corresponding carbon balance coefficient is prepared according to the sintering position of the low-cobalt hard alloy; a sintering boat is arranged at the sintering position of the low-cobalt hard alloy, wherein the height of the boat is larger than the height of the pressed blank; the pressed blank is placed into the sintering boat to be sintered; and whether the relative magnetic saturation of the sintered alloy meets a set value or not is measured, and sintering is repeated until the relative magnetic saturation of the alloy reaches the set value. The surface modification process carried out after low-cobalt alloy preparation is omitted, the crack phenomenon occurred when a hard alloy blade and the steel are welded is improved, and the welding performance of the low-cobalt hard alloy is improved.