Abstract: As an important strategic resource, cobalt plays an important role in alloy materials, catalytic materials and battery materials. In the typical hydrometallurgical recovery process of cobalt, ammonia leaching has the advantages of pure leaching solution, short process, and low cost. It is widely used in the smelting of cobalt minerals and the recovery of secondary resources. The ammonia recovery process of cobalt resources at home and abroad in recent years have been systematically summarized in this article, including the principle and process of ammonia leaching, and the recovery of cobalt in the ammonia leaching solution. In the ammonia leaching process, the right choice of ammonia-ammonium salt leaching system is very important, and according to the composition of the raw materials, add a certain reducing agent or oxidant to increase the leaching rate. The current methods for recovering and preparing cobalt products from ammonia leaching liquid still have disadvantages such as high cost and small processing volume. Therefore, developing efficient and economical methods for recovering and preparing cobalt products from ammonia leaching liquid will become the focus of future research.