Crane and self-disassembly and assembly system, self-assembly method and self-disassembly method thereof

The invention belongs to the field of cranes, and discloses a crane as well as a self-dismounting system, a self-assembly method and a self-dismounting method thereof, the self-dismounting system is arranged at the tail part of a rotary table, so that a front-section component of a folding and unfolding mechanism in a superlift counterweight luffing system can be hoisted by virtue of a lifting hoisting mechanism in the self-dismounting system; and the lifting of the front-section component is realized. Under the condition that the front end of the front section component is hinged to the tail of the rotary table, the folding and unfolding mechanism can be integrally dragged by means of a traction swing mechanism in the self-disassembly and assembly system, so that the folding and unfolding mechanism can swing up and down around the tail of the rotary table. Therefore, no matter the folding and unfolding mechanism is assembled or disassembled, the whole folding and unfolding mechanism can be suspended through