Drilling waste or waste mud is one of the main pollution sources in the oil and gas industry. Due to engineering requirements, oil, water, organic clay and other substances are mixed in the oil drilling mud. In the past two years, drilling crews have used more and more oil-based mud, water-based mud and composite-based mud, and the accompanying cost increase and environmental pollution problems have become more and more serious. The emergence of the mud zero-discharge treatment system has successfully solved the problem that drilling waste cannot be treated efficiently and environmentally. Different from the traditional method, the mud zero-discharge treatment system changes the waste mud from end treatment to full process control. The waste mud is diluted-flocculated-separated into three