Abstract: There are a large number of coal water mixtures in hydraulic flushing process in gas drainage hole of floor rock tunnel. Coal water mixtures are collected and deposited in sedimentation tank excavated in floor rock tunnel, and dredged by manual work, transported with mine car. But the coal water mixtures are usually accumulated in drill site, which deteriorates working environment, increases labor intensity, and restricts drilling efficiency. For this issue, a water and coal separating system is designed and optimized, which includes pipe, vibrating screen, filter press, submersible sewage pump and belt conveyor. Water coal mixtures are collected respectively in the drill site, gathered in the main sedimentation tank, sieved by vibrating screen, pressured and filtered by filter press, and the separated briquette is conveyed by belt conveyor.