To realize the automatic adjustment controlling the height of the roller in the cutting process of the shearer, a dynamic identification method of coalrock interface based on acoustic emission signal is proposed to test and extract the acoustic emission characteristic signals. Using timedomain analysis method gets the time domain indexes under the different conditions, using wavelet analysis method extracts the coalrock cutting acoustic emission signal characteristic value. The different coalrock cut ratio under the condition of acoustic emission signal optimal membership function is established to dynamic monitoring coal and rock ratio, then the purpose of coalrock interface identification is achieved. The results of laboratory tests show that there is little difference between the trajectory of the roller and the coalrock, and the experimental results verify the accuracy and reliability of the recognition system.