The present invention provides a verification unit and method for a power transmission line breeze-induced vibration monitoring device. According to the verification unit and method of the invention, the verification unit is connected into the measurement circuit of the power transmission line breeze-induced vibration monitoring device so as to control a change-over switch in the verification unit so as to switch different verification modes according to different parts of the power transmission line breeze-induced vibration monitoring device and verify the functions of the power transmission line breeze-induced vibration monitoring device wholly, thereby ensuring that a worker can timely adjust and repair the power transmission line breeze-induced vibration monitoring device when test data of the power transmission line breeze-induced vibration monitoring device are not reliable. The verification unit comprises a verification sensor which is used for collecting the data of the power transmission line breeze-induced vibration monitoring device, a verification resistor unit which comprises four resistors that have the same resistance and are connected in parallel in the measurement circuit of the power transmission line breeze-induced vibration monitoring device, and a change-over switch which is used for controlling the verification sensor or the verification resistor unit to be connected into the measurement circuit of the power transmission line breeze-induced vibration monitoring device.