The invention relates to an eluting device for the insulating oil-gas chromatographic analysis of a transformer. The eluting device comprises a cylindrical metal eluting body with an opening in the upper end, wherein an upper sealing cap covers the upper end of the eluting body through a thread in a screwing manner, the lower-half part of the inner space of the eluting body is filled with a filler, the upper-half part of the inner space of the eluting body serves as an eluting gas space, an upper gas inlet and outlet hole is formed in the top surface of the upper sealing cap, a lower gas inlet and outlet hole is formed in the lower bottom surface of the eluting body, a vertically-downward heating rod hole is formed in the top of the right side wall of the eluting body, a vertically-downward temperature measuring hole is formed in the top of the left side wall of the eluting body, a heating rod corresponding hole corresponding to the heating rod hole and a temperature measuring corresponding hole corresponding to the temperature measuring hole are formed in a top cover of the upper sealing cap. The eluting device is simple and reliable in structure; and the operation time of an analyst is greatly saved, and the degassing rate is far higher than that of a standard requirement.