The invention relates to an enclosed electric box for regulating and controlling inside microenvironment, and an air outlet is arranged on the upper part of the electric box; the microenvironment control system comprises a microenvironment controller, a sensor and an intelligent control unit; the microenvironment controller is arranged on the upper part of the electric box and is controlled by the intelligent control unit, and a control signal comes from the sensor; the microenvironment controller comprises a shell and a fan; an air inducting hole is arranged on the shell; the fan is arranged in the shell and is used for sending the air inducted from the air inducting hole to the electric box through an air outlet of the fan; the air outlet of the fan is an air inducting outlet which can control supplying air downwards in linear way. The advantage of the electric box comprises: 1. an airflow field and a temperature field are balanced and are established in the box body, so that the airflow evenly flows through all heat source bodies and takes energy and water out of the box body finally; 2. temperature gradients in and out of the box body as well as everywhere in the box body are reduced, cold surfaces are eliminated, and condensation conditions are destroyed; 3. the protection box has wide application environment and has less limitation on internal space and shape of the box body.