This main control valve, as a multi-channel control element, can simultaneously coordinate the actions of multiple key mechanisms of the crane, such as boom extension and retraction, luffing, slewing, and outrigger extension and retraction. During operation, it receives operating commands and distributes hydraulic oil to the corresponding actuators. For example, it controls the oil supply to the boom cylinder to achieve boom lifting and lowering, and regulates the oil circuit of the slewing motor to achieve smooth turntable rotation. This allows the operator to simultaneously or individually control different mechanisms, meeting the complex coordination requirements during lifting operations, such as adjusting the boom angle while simultaneously fine-tuning the turntable direction for precise alignment.