The utility model relates to a non -contact magnetism encoder. Non -contact magnetism encoder is including tube structure, flange and function element. The tube structure has blind end and open end. Open end department is located to the flange to it forms the holding chamber to enclose to close with the tube structure. The function element, including installation axle, magnet steel and the measurement chip who is located the holding intracavity, in the direction of open end to blind end, installation axle, magnet steel and measurement chip arrange in proper order. Installation axle and flange joint, it is epaxial that the installation is located to the magnet steel. Measurement chip and flange joint, and relative interval with the magnet steel sets up. The utility model provides a non -contact magnetism encoder at the in -process of equipment, only needs to install the function element in proper order on the flange, again can with flange joint with the tube structure. Just can accomplish the counterpoint when assembling the function element on the flange, need not the processing of counterpointing in flange and tube structure for the installation degree of difficulty is low, more labour saving and time saving.