Generally, the computer mainframe is equipped with a power supply to provide different voltages required by various parts.As the name implies, the power supply converts alternating current into stable direct current power of different voltages for use by various components in the computer.Generally, switching power supply and computer system, A stable and reliable cooling fan is required to maintain the normal operation of the system.the common power supply is provided with a single heat exhaust fan on its end face close to the outer edge to reduce the high temperature generated by the power supply and the computer host system to prevent the system from being damaged due to overheating.its advantages are simple and cheap, but its disadvantages are high failure rate, lack of reliability and no adjustment function.

The invention provides a double-regulation cooling fan airflow device for a computer power supply appliance, which is characterized in that a main cooling fan is arranged on the front end face of the computer power supply appliance, and one pair of cooling fans are arranged on the other end face; one side of the main fan is provided with a multi-section selective adjusting button for users to make proper adjustment according to requirements; and the auxiliary cooling fan is controlled by an internal environment temperature detection circuit of the power supply appliance, so that the novel power supply appliance of the invention has a double-regulation cooling fan airflow device capable of self-adjustment, automatic detection and adjustment, high heat dissipation efficiency and multiple heat dissipation guarantees.