The invention discloses a construction method of a deep water mixed embankment. The mixed embankment includes a trapezoidal hollow component, a rock rip-rap foundation bed, a sand rib and concrete interlock block mixed software platoon, spats stones, and shoulder stones. The construction method includes the following steps of one, layout of the sand rib and concrete interlock block mixed softwareplatoon; two, rock rip-rap on water; three, foundation bed leveling; four, trapezoidal hollow component arranging; and five, rip-rap and filling of the spats stones and the shoulder stones. The construction method of the deep water mixed embankment solves the problems that precision is low and loss amount is high in deep water foundation bed rock rip-rap; efficiency of leveling and component prefabricating is low; accuracy of component arranging is low; the overall mechanization degree is low; and an overall construction process is not cohesive.