Capillary viscometer with auxiliary constant temperature function

The utility model discloses a capillary viscometer with an auxiliary constant temperature function. The capillary viscometer comprises a vertically arranged liquid adding pipe, a capillary tube, an exhaust pipe, and a capillary viscometer body which is formed by a U-shaped conduit communicated with the liquid adding pipe, the capillary tube and a lower pipe orifice of the exhaust pipe, wherein the capillary viscometer body is arranged in a transparent heat insulation heating jacket in a sealing way, and the transparent heat insulation heating jacket is provided with a base; the upper side wall and the lower side wall of the transparent heat insulation heating jacket are respectively provided with a liquid inlet pipe joint and a liquid outlet pipe joint; the liquid adding pipe, the capillary tube and an upper pipe orifice of the exhaust pipe extend out of the top wall of the transparent heat insulation heating jacket in a sealing way. The capillary viscometer has the advantage that the structure of the existing capillary viscometer is improved, so that the problem that the existing capillary viscometer needs to be matched with a constant temperature water bath when being used for measuring the viscosity can be solved. When the capillary viscometer is used for measuring the viscosity, the liquid inlet pipe joint and the liquid outlet pipe joint are communicated with an external constant temperature medium pipeline, so that a circulation is formed, and the capillary viscometer can be operated at the needed constant temperature.