Accounting disclosure via the Internet brings many benefits at the level of stakeholders in general and investors in particular, as it facilitates the process of collecting and processing information, in addition to obtaining different types of financial and non-financial, qualitative and quantitative information, which in turn helps investors and other stakeholders narrow down Information gap, reduced information asymmetry and adverse selection risk. Therefore, this research aims to evaluate the effectiveness of online disclosure of environmental information, and determine the content of this environmental information disclosure, in addition to evaluating the effectiveness of online disclosure of environmental information in improving stock prices on a sample of Libyan companies. A sample of Libyan companies listed on the stock exchange was selected from 2017 to 2021, and the number of companies in the sample reached 50 companies. Data related to the study variables were collected through companies' annual financial reports and their electronic pages. The results of the study showed that electronic disclosure of environmental responsibility has a significant positive impact on stock prices. Therefore, companies seeking to increase their value should focus on electronic disclosure of environmental responsibility.