The invention discloses a duplication dynamics automatic adjustment structure assembly of a stylus printer. The duplication dynamics automatic adjustment structure assembly of the stylus printer comprises a support and a paper-thickness regulating shaft of an eccentric shaft, wherein one end of the paper-thickness penetrates through the support, and then a paper-thickness slection lever is fixedly installed at a tail end of the paper-thickness regulating shaft. The paper-thickness selection lever is in a sector structure, and a surface of the selection lever is divided into an inner sector shape and an outer sector shape. File position teeth are arranged on one end surface of the inner sector shape along diameter direction of the inner sector. Blocking needles locked in the file position teeth are arranged on the support. A U-shaped photo-electricity sensor is installed on the end surface of the support nearby the paper-thickness selection lever. Blocking slices capable of sheltering beams of the U-shaped photo-electricity sensor are arranged on the paper-thickness selection lever. A duplication dynamics state of the automatic adjustment stylus printer is capable of abandoning a duplication dynamics adjustment manner of manually regulating the duplication dynamics through a panel press button in the traditional technology. The duplication dynamics automatic adjustment structure assembly of the stylus printer is simple in structure, reasonable and compact, saving in bill material and high in printing efficiency.