The invention relates to the technical field of pharmaceutical preparations, and discloses a sitagliptin metformin tablet preparation and a preparation method thereof. The preparation is prepared from metformin hydrochloride, sitagliptin phosphate monohydrate, an adhesive and a lubricant through a hot melt extrusion method. According to the invention, a hot melt extrusion technology is adopted, metformin hydrochloride and an adhesive are mixed, the mixture is melted, extruded and conveyed in a hot melt extruder to obtain solid dispersion strips, the solid dispersion strips are cut off, crushed and sieved, the sieved solid dispersion strips are mixed with sitagliptin phosphate monohydrate, and then a lubricant is added for mixing, so that prepared particles are uniform and have better fluidity and good compressibility; in the production process, few auxiliary materials are needed, the production cost is reduced, the production procedures are reduced, the content and content uniformity of the obtained product far exceed the product quality requirements, the reproducibility is good, continuous operation can be achieved, continuous production is achieved, and the difference between batches is reduced.