The invention relates to a heat-preservation and water-seepage compound type blind ditch of a deep trench of a severely cold and frozen earth area and a construction method of the heat-preservation and water-seepage compound type blind ditch. The structure mainly comprises a water separation layer, a lower heat-preservation layer, a waterproof geotextile, a flag stone layer, a non-woven geotextile inverse filtering layer, a concrete base, a water drainage pipe, a medium-coarse sand cushion layer, a round gravel soil layer, an upper heat-preservation layer, a foundation bed, a geogrid, a slope protection layer, a flag stone air outlet hole, a top sealing layer, an edge slope backfilling layer and a slope protection layer. The construction method mainly comprises the following construction steps: spreading the water separation layer, digging a step, spreading the lower heat-preservation layer, spreading the waterproof geotextile, mounting the water drainage pipe, mounting the geogrid, spreading the flag stone layer, spreading the non-woven geotextile inverse filtering layer, spreading the round gravel soil layer, spreading the top sealing layer, spreading the upper heat-preservation layer and backfilling the foundation bed. The construction method provided by the invention is simple and the construction efficiency is high; the obtained heat-preservation and water-seepage compound type blind ditch of the deep trench of the severely cold and frozen earth area has stable quality, has advantages of good heat-preservation effect, high water-seepage efficiency and the like, has relatively good economic and technical benefits and is worthy of being popularized and applied.