The invention discloses an air current control system, in particular to an air current control system capable of continuously producing temperature, relative humidity, and pressure-controllable air current. The system comprises an air filtering device (11) used for obtaining clean dry air, a flow control device (12) which is used for controlling the flow rate of air current and connected with theair filtering device (11), a constant temperature humidifier (13) that is used for humidifying the air current and connected with the flow control device (12), a water filtering thermotank (14) that is used for removing redundant water in the air current and connected with the constant temperature humidifier (13), a heating thermotank (15) that is used for heating the air current and connected with the water filtering thermotank (14), and a throttling regulation valve (16) that is used for changing and controlling the pressure of the air current and arranged on a pipeline connected with an outlet of the heating thermotank (15). The system is applicable to the experiments which need temperature, relative humidity and pressure-controllable air current which is continuously produced.