The utility model provides a prefabricated high-strength composite drainage ditch. The prefabricated drainage ditch comprises a prefabricated ditch body assembly, a prefabricated framework assembly, aprefabricated end socket plate assembly and a prefabricated water grate assembly. The prefabricated ditch body assembly and the prefabricated framework assembly are fixed, the prefabricated frameworkassembly supports the prefabricated ditch body assembly, the prefabricated water grate assembly is embedded in the upper portion of the prefabricated ditch body assembly, each end of the drainage ditch is connected with the prefabricated end socket plate assembly, and the prefabricated end socket plate assemblies are fixed to the prefabricated framework assembly or the prefabricated ditch body assembly. All the components are prefabricated, the components are assembled through modules, the components are flexible and variable, adaptability is high, a masonry process is not needed, and construction is convenient and fast; the drainage ditch is simple in structure and convenient to install, and the construction speed can be increased.