Abstract: In view of the present low level of automation and intelligent control of boom roadheader,automatic cutting control technology is proposed.By establishing the mathematical model of cutting head space design of the cantilever machine automatic control system,at the same time,based on the programmable computer controller PCC modular functions to complete the program design of automatic cutting control system.Aiming at the defect of the low degree of visualization,design the PC monitoring,real-time communication with the PCC,to realize the real-time monitoring of running status of machine.Inoue underground experiment was carried out at last,the results show that the control system is stable and reliable operation,high repeat precision,no cumulative deviation,completion of automatic cutting and brush help function,no obvious error of two sides of roadway,can well realize the automatic cutting.