Cit intelligent ventilation control system

The invention provides a CIT intelligent ventilation control system, which comprises one or a plurality of ventilation cabinets (10), a main air pipe (21), an exhaust fan (22), an exhaust fan controller (23), a first frequency changer (24), an indoor pressure sensor (31), an indoor pressure controller (32), an air supply controller (33), a second frequency changer (34), an air blower (35), a first air supply valve (36), an external air supply pipe (37) and an air diffuser (38), wherein a cabinet door (11) is arranged on the exhaust cabinet (10), an exhaust controller (13) and a door position sensor (14) are arranged inside the exhaust cabinet (10), the front side of the exhaust cabinet (10) is provided with a surface air speed sensor (15), and an exhaust opening of the exhaust cabinet (10) is provided with an electric air valve (12). The CIT intelligent ventilation control system provided by the invention has the advantages that the functions of surface air speed constancy and exhaust speed self adaptability are realized, the overflowing of harmful gas out of a room is avoided, the energy consumption is also reduced, meanwhile, the room pressure automatically maintains constant, and the comfort of environment is maintained.