A writing device for electronic paper includes an array substrate, a master control module, an input module electrically connected with the master control module, and an array substrate driving module electrically connected with the master control module, the array substrate is electrically connected with the array substrate driving module, an upper surface of the array substrate is configured to be electrically connected with electronic paper to be written, the input module is configured to input operation instructions to the master control module, the master control module is configured to control the array substrate driving module to drive the array substrate for performing writing operations according to the operation instructions. An embodiment of the present invention further provides an electronic paper tag system including the electronic paper writing device. Therefore, the writing device and the electronic paper tag system provided in embodiments of the present invention are particularly applicable to situations in which tag information is not required to be updated frequently (for example, doorplate, merchandise price labels).