The invention relates to a visual electrospun fiber environment maintaining device and a visible maintaining method for an air curtain, and belongs to the technical field of electrostatic spinning. Inorder to solve the problems about temperature and humidity constant control over electrostatic spinning and make a spinning space compact and adjustable, the device is technically characterized in that an air blowing port of an air blowing groove forms an airflow-controllable section, and a relatively closed rectangular space is formed in an electrospun fiber jetting environment by the section and a collection plate at the bottom. The device has the advantage of making the spinning space compact and adjustable.