Ammonium borane (NH3BH3, AB), as the simplest B-N compound, has a simple structure, a light molecular weight of only 30.7 g/mol, and a hydrogen storage capacity of up to 19.6 wt%, making it one of the most ideal liquid phase hydrogen storage materials at present.The key to achieving efficient hydrogen production is the preparation of catalysts with high selectivity and stability.This article adopts a solvothermal method to synthesize copper oxide nanosheets (CuO-Ns) with nano defects in a high concentration alkaline solution, and explores the preparation of catalysts with different morphologies by changing the hydrothermal temperature and time during the preparation process.The investigation results show that when the hydrothermal temperature is 373 K and the hydrothermal time is 12 hours, the morphology of the catalyst is nanosheets, with the best catalytic activity and the highest reaction conversion frequency (TOF) value. At this time, the TOF value of the catalyst is 115.21 h-1, and the AB hydrogen production rate is positively correlated with the AB concentration and catalyst concentration.