Abstract: The separated layer water hazard has the characteristics of large instantaneous water volume, no obvious phenomenons of water inrush, and great harm, which seriously affects the production safety of the working face.This paper taking the 2075E working face of Qianjiaying Mine as an example, combined with the analysis of mine geology and hydrogeological data, based on the disaster-causing conditions and water damage types of separated layer water, the working face is judged to be the possibility of water inrush and the classification analysis of separated layer water hazard.The results show that the disaster caused by roof separation strata water-inrush must include the conditions of separation development, separation area water, and detachment water outburst.According to the characteristics of separation water inrush, the water hazards of separation are divided into three categories that hydrodynamic pressure type separation water inrush, hydrostatic pressure type separation water inrush, and mining fracture type separation water inrush.And the analysis show that the possibility of separation water inrush in the working face of Qianjiaying Mine 2075E is relatively high, and the water inrush type is hydrostatic pressure type separation water inrush.The research results provide theoretical and technical support for the effective prevention and control of coal seam roof water damage in mines.