Circuit board

The invention discloses a circuit board, relates to the technical field of circuit boards and mainly aims at making wind volume regulation of a sparse device region and a dense device region on a single board more convenient and improving the heat dissipation effect on devices on the circuit board. According to the main technical scheme, the circuit board comprises a circuit board body and a windresistance regulation device, wherein the circuit board body is provided with the sparse device region; the wind resistance regulation device comprises a detection unit for detecting a wind speed value of the sparse device region, a regulation mechanism and a control device, wherein the regulation mechanism is arranged on the circuit board body and located in the sparse device region and is used for regulating the wind resistance of the sparse device region; and the control unit is connected with the detection unit and the regulation mechanism separately and is used for receiving the wind speed value, controlling the