The utility model discloses a multifunctional joint for a filter element of a cartridge filter for a water-softening plant and belongs to the technical field of filter elements of filters. A second bolt is arranged at one end of a second upper plug; a first bolt is arranged at one end of a first upper plug; the first upper plug is connected with a first baffle; the lower part of the first baffle is connected with a first lower joint; a first threaded inner hole is formed in the lower part of the first lower joint and is connected with the second bolt on the second upper plug; the second upper plug is connected with a second baffle; the lower part of the second baffle is connected with a second lower joint; a second threaded inner hole is formed in the lower part of the second lower joint. During use of the multifunctional joint, the first bolt on the first upper plug is connected with a filter element holder. The multifunctional joint disclosed by the utility model has the advantages that according to a field experiment, an excellent effect is achieved. The water yield of the cartridge filter is not influenced, and the outlet water quality of the cartridge filter reaches the standard.