The invention discloses a dust removal method for waste rock smashing in an underground coal mine chamber. The dust removal method is suitable for dust removal and dust fall of the underground coal mine operation chamber generating a lot of dust. A smashing chamber is constructed between an air inlet way and an air return way and used for communicating the air inlet way with the air return way; an exhaust fan is arranged inside the air return way, and an adjusting door is installed on the side, connected with the air return way, of the smashing chamber; a smashing machine is then arranged inside the smashing chamber, a waste rock inlet belt and a waste rock outlet belt connected with the smashing machine are arranged on the side, connected with the air inlet way, of the smashing chamber, underground coal mine waste rock is conveyed to the smashing machine through the waste rock inlet belt, the waste rock which is smashed through the smashing machine is conveyed out of the chamber through the waste rock outlet belt, and when the waste rock is smashed in the smashing machine, air exhausting is performed through the exhaust fan, air pressure inside the air inlet way is controlled to be higher than that inside the air return way, air flows into the air return way through the smashing chamber from the air inlet way, and then dust removal is performed. In this way, air cleanness of the operation space of workers is guaranteed. According to the method, dust removal equipment does not need to be additionally arranged, design is simple, and using is safe and reliable.