The invention discloses an environment-friendly industrial waste gas purification device. The device comprises a first butt joint ring, a butt joint main body is fixed to the lower end of the first butt joint ring in a threaded opening and closing mode, screws are correspondingly fixed on the outer side end of the first butt joint ring and the outer side end of the butt joint main body in a threaded mode, a second butt joint ring is arranged at the lower end of the butt joint main body in a threaded opening and closing mode, a first butt joint plate is arranged inside the butt joint main body,the side end of the first butt joint plate is provided with a second butt-joint plate in a threaded opening and closing mode, the side end, deviating from the first butt joint plate, of the second butt joint plate is provided with a third butt-joint plate in a threaded opening and closing mode, the side end, deviating from the second butt joint plate, of the third butt joint plate is provided with a fourth butt-joint plate, and the side end, deviating from the third butt joint plate, of the fourth butt joint plate is provided with a fifth butt joint plate. According to the environment-friendly industrial waste gas purification device, assembly and disassemble are convenient, a part of parts can be disassembled in the maintenance and cleaning process, the part of the parts can be installedafter cleaning is completed, and the use requirements can be better met.