The invention discloses a digital micro-mirror element, which comprises a housing, a digital micro-mirror chip, a transparent packaging element and a heat conducting plate, wherein, the digital micro-mirror chip is positioned in the housing; the transparent packaging element is positioned above the digital micro-mirror chip and is used for packing the digital micro-mirror chip, therefore, a beam outside can penetrate through the transparent packaging component and reach at the digital micro-mirror chip; and the heat conducting plate is connected with the transparent packaging component and the housing. The digital micro-mirror element of the invention adopts the heat conducting plate to connect the transparent packaging component and the housing, therefore, heat energy produced in the working process of the digital micro-mirror can be conducted to the housing by penetrating through the heat conducting plate, moreover, stray lights which are projected on the digital micro-mirror element can be absorbed.