The invention discloses a construction method for an anti-seepage joint of anti-cracking bituminous concrete and clay. The anti-cracking bituminous concrete and the clay are adopted to prevent seepage. The construction method is characterized in that firstly, the anti-cracking bituminous concrete is prepared; then, a bituminous concrete anti-seepage layer is laid on the surface of a reservoir slope or a dam slope, and the gradient of the anti-seepage layer is the same as that of the reservoir slope or the dam slope; a clay anti-seepage layer is laid at the reservoir bottom, and the clay anti-seepage layer and the concrete anti-seepage layer have a section of overlapped lap joint part. The construction method for the anti-seepage joint of the bituminous concrete and the clay is convenient to construct, low in cost and good in anti-seepage performance.