The utility model relates to a class II chassis repacking instrument, concretely relates to portable riveter. Portable riveter, including the frame frame, frame frame lower extreme sets up the gyro wheel, two the fixed supporting racks in preceding frame pole upper end, supporting rack upper end fixing sleeve, the rotation axis passes two sleeves, the both ends of rotation axis are connected the left branch respectively and are held the one end that pole and right branch held the pole, the fixed elevating gear of left side frame pole, elevating gear's upper end and left branch hold pole fixed connection, the other end that the left branch held pole and right branch vaulting pole passes through the round pin hub connection with the upper portion of company's board respectively, even the lower part of winning in succession is passed to the one end of axle, even two lateral walls of U type frame are connected respectively to the other end of axle, the lateral wall upper end of U type frame sets up drive arrangement and fixed axle respectively, the drive arrangement front end sets up the punching press head. The utility model discloses drive arrangement and fixed axle can remove along with the frame support, and applicable class II chassis repacking riveted needs, has alleviateed workman intensity of labour, have improved riveting efficiency and riveting effect, have reduced the expense.