Multifunctional integrated setting, squeezing and fishing tool and pulling-out-free squeezing and fishing method thereof

A hydraulic delivery mechanism, a setting mechanism and an ash squeezing mechanism are sequentially connected to the lower portion of an upper connector of the tool, the setting mechanism comprises a rubber sleeve seat, the periphery of the rubber sleeve seat is sleeved with a lower rubber sleeve, the bottom of the lower rubber sleeve abuts against an outer step of the rubber sleeve seat, and the lower rubber sleeve is sleeved with an upper rubber sleeve. A slip outer cylinder is pressed on the top of the lower rubber cylinder, and the lower end of the slip outer cylinder is sleeved on the periphery of the upper part of the rubber cylinder seat; slips are respectively embedded in middle notches of the slip outer cylinder; and the inner conical surfaces of the slips are propped against the outer conical surface of the lower part of the slip cone. And a sliding sleeve for controlling the ash extrusion channel is arranged in an inner cavity of the rubber sleeve seat. The operation sequentially comprises the foll