Abstract: For a problem that lump coal fractures easily because of large drop of transshipping point during lump coal transport in coal preparation plant, a lump coal transshipping anti-fracturing system based on PLC was proposed. Working principle of the system and a design scheme of PLC control system were introduced. The system detects coal level signals by use of ultrasonic level-meter，and uses PLC to control frequency converter to adjust speed of electric spin wheel according to the coal level signals for outputting lump coal slowly, so as to reduce lump coal fracturing.