The invention discloses pet chews containing coarse grains and a preparation method of the pet chews, belonging to the field of pet food processing. Particularly, the pet chews are prepared from the coarse grains and plants by a mechanical puffing process. The pet chews are characterized by comprising the following components in parts by weight: 30-42 parts of corn starch, 18-27 parts of flour, 15-22 parts of coarse grains, 5-7 parts of gelatin, 10-15 parts of glycerin, 0.01-0.05 part of xanthan gum, 0.02-0.05 part of potassium sorbate, 0.03-0.06 part of monoglyceride, 0.05-0.1 part of salt, 0.5-1.0 part of sugar, 3-5 parts of sorbitol, 0.3-0.5 part of a pet essence, and 0.01-0.05 part of sodium citrate. The pet chews are low in cost, the production of the pet chews is not affected by short supply of the raw materials and weather, and the pet chews are more suitable for large-scale production. The pet chews have teeth grinding and dental care functions, and are beneficial to promoting and improving pet intestine and digestive absorption by virtue of the contained coarse grains.