Abstract: With the deepening of digital and intelligent construction in coal mines,hydraulic equipment is constantly being updated and replaced,and hydraulic support fluids are also constantly being updated,with increasingly diverse types and functions. Domestic and foreign researchers have not only optimized the formula of emulsion oil for hydraulic support,but also developed environmentally friendly emulsion fluid and concentrated fluid for hydraulic support. We summarize the research progress and achievements of hydraulic support fluids at both home and abroad in recent years,detail the composition of concentrated fluid for hydraulic support,and predict the future development trend.