Energy is the lifeline of a country's economic development, but also the important foundation to improve people’s lives. With the continuous development of China's social economy, as a big energy-consuming industry, the building industry has been consuming more and more energy, greatly increasing the pressure of the energy supply for our country, and even restricting the development of our national economy, so the practical application of environmental protection and energy saving in building electrical design is of great significance to the economic development of our country. This paper analyzes and discusses the practical application of environmental protection and energy saving in building electrical design.