The invention discloses compound yak blocks for balancing minerals in warm seasons. Each kg of blocks are formed by the following raw materials: 0.3-0..9g of zinc sulfate, 0.3-0.6g of copper sulfate, 0.01-0.02g of sodium selenite, 0.07-0.2g of potassium iodide, 0.04-0.08g of cobalt chloride, 20-40g of magnesium oxide, 3-6g of chromium nicotinate, 50-100g of calcium hydrophosphate, 300-500g of salt, 200-400g of bentonite, 30-60g of cement, 20-100g of limestone and 30-60g of molasses. The invention simultaneously provides a preparation process of the compound yak blocks. The blocks and the preparation process have the following advantages: according to the seasonal characteristics of yak production and seasonal variations of contents and compositions of mineral elements in grass, in combination with compositions and quantities of mineral elements in soil ingested by the yaks, the yak block mineral formula is optimized in real time to realize balanced supply of the mineral elements to the yaks; the chemocoagulation process and the mechanical compaction process are optimally combined; and the products have high density and reasonable feed intake and are suitable for yak mineral element supply in warm seasons.