The invention discloses a reflective ultrasonic anemoscope and a measuring method thereof. The reflective ultrasonic anemoscope comprises four parts, namely a probe mounting seat (1), ultrasonic probes (21, 22, 23 and 24), a bracket (3) and a reflecting surface (4), wherein the four ultrasonic probes (21, 22, 23 and 24) are fixedly arranged on the probe mounting seat (1), are divided into two groups and are arranged on two orthogonal axes; and various ultrasonic probes (21, 22, 23 and 24) transmit ultrasonic signals in turn, and opposite ultrasonic probes (21, 22, 23 and 24) receive signals reflected by the reflecting surface (4). A wind speed value and a wind direction value are solved by a vector composition method. The reflective ultrasonic anemoscope eliminates influence on measurement due to a difficultly fixed measuring structure and great change of signal intensity along with the wind speed.