Abstract: The present invention provides an interference prevention control device of a work machine, wherein the interference prevention control device is capable of limiting movement of a cab based on a position of a tool and thereby preventing interference of the cab with the tool as well as improving the work efficiency of the work machine. A cab position sensor for detecting a position of a movable cab, as well as a boom angle sensor and an arm angle sensor for detecting a position of a tool at the distal end of the work equipment, are connected to a controller. Solenoid-operated directional control valves for limiting movement of a cab lifting cylinder are disposed in pilot passages of a spool of a pilot-operated control valve, and the solenoids of the solenoid-operated directional control valves are connected to the controller.