The monitoring of water channels during coal mining is of great significance for the prevention and control of water damage in deep mines. The real-time monitoring function of microseismic monitoring technology provides the possibility of tracking damage. The fractured zone area of the mining face has increased the smoothness of the water inrush channel, making water hazard prevention and control more difficult. Therefore, based on the results of microseismic monitoring, this article proposes the energy kernel density analysis method for microseismic events, and studies the characteristics of bottom plate failure during the mining process in the fractured zone area according to the method. The results show that the energy kernel density analysis method for microseismic events can quantitatively evaluate the degree of rock damage, accurately reflect the location, strength, and time of damage to the floor rock layer during the mining process, obtain the maximum depth of damage to the floor under the influence of mining, and evaluate the water inrush channel of the floor. The method was applied to the mining process in the fractured zone area of Zhangji Coal Mine 1610A face in the Huainan mining area, and the degree of mining influence on each rock layer of the floor was obtained. The maximum depth of floor failure was determined to be 18 m, and the characteristics of floor failure during the mining process in the fractured zone area were also obtained. The research results provide reference for water damage monitoring and prevention during mining in fractured zone areas.