This invention relates to a glimepiride tablet and its preparation method. The glimepiride tablet, by weight, comprises: 2.0 parts glimepiride, 150-160 parts diluent, 8-15 parts disintegrant, 0.8-1.2 parts binder, and 0.8-1.2 parts lubricant. The diluent is selected from any one or more of the following: lactose, microcrystallinecellulose, or combinations thereof. This invention optimizes the product formulation and preparation process of glimepiride tablets, reducing the impurity content in the tablets and significantly improving the product's stability and dissolution performance.