The present invention discloses an environment chamber for simulation of an outdoor working condition. The chamber comprises a building enclosure, a first air supply static pressure space, a second variable cross-section air supply static pressure space, a test chamber, a variable cross-section air return static pressure space, a first air processing unit arranged on the building enclosure and a second air processing unit arranged on the separator of the test chamber. The air supply airflow enters the first air supply static pressure space from the air supply outlet on the building enclosure, enters the second variable cross-section air supply static pressure space from an air supply door, then enters the test chamber through an air supply aluminum alloy blind window and is sent out via an air return inlet through the variable cross-section air return static pressure space. The environment chamber employs an air return mode of air supply at the side and air return at the upper portion, and the two static pressure spaces and the variable cross-section air return static pressure space are employed to ensure the temperature and humidity in the test region in the environment chamber and uniform and stable air flow when test and ensure that the test working conditions satisfy the requirements of the serial standard outdoor side such as GB/T17758-2010 , etc.