The utility model relates to a heat-conducting plastic heat transfer module for a counter-flow closed cooling tower. The heat transfer module comprises upper collecting pipes, lower collecting pipes and a module frame. The upper collecting pipes and the lower collecting pipes are fixed on the module frame respectively. Two ends of a plurality of heat-conducting plastic thin pipes are subjected to hot melting onto the upper collecting pipes and the lower collecting pipes respectively to form a layer of heat-conducting plastic thin pipe grids. Partition plate bars are arranged among the thin pipes to keep space, and the middles of the thin pipe grids are fixedly connected onto fixing plates on two sides through support rods respectively. Tension units are arranged between the fixing plates and the module frame respectively, and used for balancing heat-conducting plastic thin pipe own deformation along length direction of the pipes caused by temperature differences and pulling. According to the heat-conducting plastic heat transfer module for the counter-flow closed cooling tower, a large heat-transfer area can be provided in limited space; the freezing resistance and the corrosion resistance are excellent; the tension units can enable the thin pipes to keep straight, reduce circulation resistance in pipes and improve the water spraying evenness. Thermal performances of a closed tower provided with the module can be improved, and application ranges can be expanded. Further, the manufacture cost of the heat-conducting plastic pipes is far lower than that of metal pipes, so that the manufacture cost of the closed tower utilizing the heat-conducting plastic heat transfer modules can be reduced.