A modularized cooler includes the at least two heat radiator modules arranged in a stack, each heat radiator module having a set of radiation fins, heat-exchange tubes arranged in parallel and surrounded by the radiation fins, two locating plates holding the heat-exchange tubes in place, and a plurality of first bends and second bends respectively connected between every two adjacent heat-exchange tubes at two sides of the radiation fins and forming with the heat-exchange tubes a continuously S-shaped piping having an inlet and an outlet, and at least one connecting tubes that connect the S-shaped pipings of the heat radiator modules in series.