Heat insulation method for machine head of double-layer extrusion machine and machine head using heat insulation method

The invention relates to a heat insulation method for a machine head of a double-layer extrusion machine. The invention has the technical scheme that the machine head of the double-layer extrusion machine comprises an inner-layer material distributor (2), a rear machine body (3), an intermediate heat insulation die (4), an outer-layer material distributor (5) and a front machine body (6), wherein the rear machine body (3) and the front machine body (6) are both provided with heating devices, the intermediate heat insulation die (4) is positioned between the rear machine body (3) and the front machine body (6), and the temperature of the rear machine body (3) and the temperature of the front machine body (6) can be insulated through the intermediate heat insulation die (4). After the technical scheme is adopted, different temperature control areas of the machine head of the double-layer extrusion machine can be insulated, and the control requirement on temperature of the machine head of the double-layer extrusion machine is realized.