The invention relates to a sliding pad type joint structure between a dam bituminous concrete impervious body and foundation concrete. Binders are arranged on the surface of the concrete body in a shelling-out mode to form a bonding surface, a plastic putty sliding pad type layer is adhesive to the bonding surface, a bituminous mixture transition layer is arranged on the plastic putty sliding pad type layer in a pouring mode, and a bituminous concrete impervious panel or a bituminous concrete impervious core wall is arranged on the bituminous mixture transition layer or the plastic putty sliding pad type layer in a laying mode. The sliding pad type joint structure has the advantages that the sliding pad type joint structure is adopted, so that the bituminous concrete impervious body which comprises the bituminous concrete impervious panel and the bituminous concrete impervious core wall can slide along a sliding pad, cracking and water leakage between the bituminous concrete impervious body and the foundation concrete after the bituminous concrete impervious body slides are avoided, erosion of the leaked water to the dam and the foundation of the dam is avoided, and operation reliability of the dam is improved; the bonding layer can guarantee that the plastic putty sliding pad type layer will not be disengaged from the foundation concrete body surface in the sliding process of the bituminous concrete impervious body; the transition layer is made of the bituminous mixture with a certain thickness, the bituminous mixture can be bituminous mortar or fine particle type bituminous concrete, and it is guaranteed that the bituminous concrete impervious body does not penetrate through the plastic putty sliding pad type layer, and the sliding capacity of joint is not reduced.