In this study, an ultrasonic resonance-based method is proposed for solving full phase wind speed and wind direction. An equilateral triangular distribution of three ultrasonic transducers A, B, and C with an interval L is established. The initial phases of echo waves received by ultrasonic transducers A, B, and C are measured based on the obtained initial phases of echo waves. Furthermore, the wind speed and wind direction data under the conditions of direct wind blowing from the vertex without angle and wind blowing from the vertex with angle are calculated.Additionally, the full-phase wind speed and wind direction algorithm established in this study is continuous and singularity-free. Under the same input conditions, the proposed method exhibits smaller wind speed fluctuation and more accurate wind direction calculation when compared to other methods.