In recent years, the problem of global warming has become increasingly prominent, and the world have advocated low-carbon economy to deal with it. The disclosure of corporate carbon information has gradually attracted widespread attention in the society. It selects 2010 to 2018 Shanghai and Shenzhen A-share listed industrial enterprises as samples, and empirically analyzes the relationship between the level of carbon information disclosure and the long-term and short-term value of enterprises and the intermediary role of equity financing costs. It is found that increasing the level of carbon information disclosure can not significantly improve the short-term value of enterprises, but can significantly improve their long-term value. This also indirectly shows that the carbon information disclosure has no immediate effect on the improvement of enterprise value, which is manifested through accumulation. In addition, increasing the level of carbon information disclosure can improve the long-term value of enterprises by reducing the cost of equity financing, which proves the mediating role of equity financing cost. The research has certain practical significance in enhancing the enthusiasm of corporate carbon information disclosure and promoting the low-carbon development.