The invention relates to a control method for a micro environment in a ring network cabinet. The ring network cabinet comprises an outer cabinet and a high-voltage cabinet, wherein the high-voltage cabinet is installed inside the outer cabinet, and the high-voltage cabinet is internally provided with a cable connection bin. The characteristics lie in that the upper part of the outer cabinet is provided with an air outlet; a micro environment controller is installed at the side surface of the outer cabinet, and the air is supplied to the outer cabinet through a fan; the air supply amount of the fan is controlled by an intelligent control unit, and control signals of the intelligent control unit come from a sensor; the cable connection bin is provided with a flow channel ventilating via a separation net so as to be used for air circulation between the cable connection bin and the outer cabinet; part of the air flow generates a transverse branch flow in the air supply process, the rest of the air flow is supplied to the bottom of the ring network cabinet and gets into the cable connection bin through the separation net so as to form an integrated air environment of the outer cabinet and the cable connection bin; and when the fan supplies air to the ring network cabinet, the exchanged hot and humid air is discharged from the air outlet at the top of the cabinet. According to the invention, the inside-outside temperature gradient and the temperature gradient of each part inside the ring network cabinet are reduced, the cold surface is eliminated and condensation conditions are damaged.