The utility model relates to a filter heat insulation sleeve, which comprises an electric wire, an inner tube body and an outer tube body, wherein the inner tube body and the outer tube body have the same cross section shape, the upper end and the lower end of the inner tube body are in an open shape, in addition, the upper end and the lower end of the inner tube body are respectively provided with external extending upper and lower flanges, the upper end of the outer tube body is open, the lower end of the outer tube body is sealed, the inside and the outside of the inner tube body and the outer tube body are coaxially sheathed, in addition, the inner tube body is connected with the outer tube body through the upper flange and the lower flange so that a cavity is formed between the inner tube body and the outer tube body, the electric wire is placed in the cavity and is covered on the outer wall of the inner tube body in a single-layer circle type, and two end heads of the electric wire sequentially pass through the lower flange and the lower end of the outer tube body to be outside the outer tube body. A diesel filter and the heat insulation sleeve are sheathed at the inside and the outside, the cold-proof heat insulation on the diesel filter can be carried out in winter, and the paraffin precipitation phenomenon of residual diesel in the diesel filter is effectively avoided, so a diesel vehicle can normally start.