Provided is a method of preparing a fermented guar meal, and specifically, a method of preparing a fermented guar meal, the method including the steps of pretreating a guar meal; seeding a Bacillus strain in the pretreated guar meal; and solid-state fermenting the strain seeded in the guar meal to obtain the fermented guar meal, a fermented guar meal prepared by the above method, and a feed composition including the fermented guar meal.