The invention belongs to the technical field of internet, and provides an online reading method and platform based on a two-dimensional bar code. The method includes the steps of obtaining ISBN, picture and text information and comment information of each book, classifying the ISBN, generating reading plans for each class of books, obtaining and scanning a two-dimensional bar code on a carrier, and obtaining a link address and an ISBN; when a reading permission is detected, skipping to a reading web page to which the link address belongs, and loading the picture and text information and the corresponding reading plan to the reading web page; according to the ISBN, generating a chat room address; when a sharing permission is detected, building an information transmission passage for the obtained user identification and the chat room address. The online reading method and platform based on the two-dimensional bar code can achieve classification of online books, provide convenience for readers to conduct systematized study, precisely and effectively manage permissions of the readers and conduct sharing and interaction of content.