Casing uncovering tool and method for low-pressure compressor

The invention discloses a casing uncovering tool and method for a low-pressure compressor. The casing uncovering tool comprises a door-shaped supporting mechanism. The door-shaped supporting mechanism is installed above the low-pressure compressor, and the lifting executing mechanism is arranged on the door-shaped supporting mechanism. Wherein the hoisting executing mechanism comprises a hydraulic cylinder body and a telescopic rod, and the hydraulic cylinder body is installed on the door-shaped supporting mechanism; the upper end of the telescopic rod is connected with the hydraulic cylinder body, and the lower end of the telescopic rod vertically extends downwards and is connected with the lifting appliance mechanism; the lifting appliance mechanism is horizontally arranged, one end of the lower portion of the lifting appliance mechanism is used for being connected with one end of an upper half casing of the low-pressure compressor, and the other end of the lower portion of the lifting appliance mechanism i