The invention discloses a modular air cooler, and relates to the technical field of low temperature storage equipment. The modular air cooler comprises a body, an air inlet, an air outlet and cold airassemblies, wherein the air inlet and the air outlet are formed in the body; the cold air assemblies are arranged in the body; the body is a regular cuboid; and a modular connecting assembly is arranged on the body and comprises bottom connectors and top connectors which are separately arranged on two side surfaces between the air outlet and the air inlet of the body and cooperate with each other. The modular air cooler has the beneficial effects that a plurality of air coolers can be arranged in a modular manner and connected, the use amount of the air coolers can be adjusted as needed, andused demands of a user are met perfectly; and the air coolers can be independently mounted, repaired or disassembled, and influence to the user who use the modular air cooler is reduced to a great extent.