The invention discloses a small-sized field wind power testing device and method. The device comprises a digital display dynamometer, a wind shield plate, a fixing frame, a supporting rod, a base, rivets, a fixing screw and a braking screw; the digital display dynamometer is fixed in the fixing frame through the fixing screw, the front end of the digital display dynamometer is provided with a wind shield, the lower end of the fixing frame is provided with a U-shaped clamping groove, the upper end of the supporting rod is provided with an upper-end flat pinhead, the U-shaped clamping groove and the upper-end flat pinhead are connected through the braking screw, the lower end of the supporting rod is connected to the base through a thread, and the four corners of the base are provided with rivets. According to the small-sized field wind power testing device and method, the included angle of the fixing frame and the supporting rod is adjustable, so that the device can be stably fixed at any slope zone, a wind power testing experiment can be conducted in a complex terrain, and therefore the test result is better in accordance with practice. The small-sized field wind power testing device is not only convenient to carry and test, but also can guarantee the authenticity and the accuracy of the test result, and the device and method is suitable for application and popularization.