The utility model discloses a large-diameter releasing hanging packer which comprises an upper connector, a lower connector, an inner center pipe, an outer center pipe and a rubber sleeve, wherein the outer center pipe is sleeved on the outer side of the inner center pipe and is connected with the upper connector at the upper end; the lower end of the outer center pipe is connected with the lower connector; an annular space is formed between the inner center pipe and the outer center pipe; a sealing piston is arranged in the annular space; a radial through hole which is communicated with the annular space is arranged on the inner center pipe; the rubber sleeve and a hanging seat unpacking device which are matched with each other are sleeved on the outer side of the outer center pipe in turn from top to bottom; a large-diameter releasing mechanism is arranged in an upper section position on the inner side of the inner center pipe; a releasing connector of the large-diameter releasing mechanism is connected with the upper connector through an anti-rotating sleeve; a baffle ring is connected with the outer side at the lower end of the outer center pipe; the baffle ring is connected with the lower connector through a thread. The large-diameter releasing hanging packer has the advantages that the sitting packing and releasing reliabilities are increased, the packing and hanging strengths are increased, the unpacking well falling risk is settled and the oil pollution problem is avoided.