The utility model relates to the technical field of running tools of downhole tools for oil and gas drilling, in particular to a hydraulic rotating invertedly-buckled releasing tool. The releasing tool comprises an upper connector, a positioning seat sleeve, a releasing ball seat and a connecting sleeve, wherein an upper connector tube cavity is formed in the upper connector; the lower part of the upper connector is connected together with the upper part of the positioning seat sleeve through a left-hand thread; a positioning seat cavity is formed in the positioning seat sleeve; and the releasing ball seat is fixedly mounted in the positioning seat cavity and can move downwards by means of shutoff pressure. The releasing tool has the advantages of reasonable and compact structure, and convenience in use; with a releasing clamping block, the positioning seat sleeve and the connecting sleeve are fixedly connected; by means of shutoff pressure, the releasing ball seat shears off a shear pin and moves downwards to allow the releasing clamping block to move radially so as to disconnect the positioning seat sleeve with the connecting sleeve; in case of complex underground conditions, the hydraulic releasing can not realized, the disengagement and releasing of the left-hand thread joint of the upper connector and the positioning seat sleeve can be realized through inverted buckling, so that the reliability and application range of the releasing tool can be greatly improved, therefore, the releasing tool has the characteristics of safety, reliability, simplicity and convenience, high efficiency.