The invention discloses a jetting tank inverted installation method. The jetting tank inverted installation method is conducted according to the following steps of digging a foundation pit below a jetting tank installation position, paving a sliding rail, arranging a perpendicular hanging point and a horizontal hanging point, enabling a jetting tank to be transversely placed, enabling one end of a conical body of the jetting tank to face towards the foundation pit, horizontally pulling the jetting tank to the position below the installation position along the sliding rail through a horizontal lifting chain block, enabling the one end of the conical body of the jetting tank to downward slide into the foundation pit, enabling the jetting tank to be perpendicularly hung to the installation position through a perpendicular lifting chain block, locking the perpendicular lifting chain block, installing the jetting tank in place after a supporting seat is welded, and detaching the perpendicular lifting chain block. According to the jetting tank inverted installation method, the cross operation between different types of professional construction is reduced, the construction cycle of the whole project is shortened, constructors can conveniently conduct the operation, the work efficiency is improved, lifting in high places is avoided, the construction safety is greatly improved, use expenses of machines are remarkably reduced, and the construction cost is saved.