The invention relates to an ultrasonic radar detection method and a device through wireless detection. The device comprises a testing jig and an electric cabinet, wherein the testing jig comprises a first motor, a second motor, sensors and an obstacle rod; the testing jig is provided with a support seat; the supporting seat is provided with a screw rod; the first motor can drive the screw rod to rotate; and the sensors are fixed on a supporting rod. The device is characterized in that the supporting rod and the obstacle rod generate relative movement through the rotation of the screw rod, andthe second rotor drives the supporting rod to rotate. The method comprises the following steps: A. the electric cabinet determines the distance between the supporting rod and the obstacle rod first through driving the first motor; B. based on the determined distance, the electric cabinet gradually adjusts the angles of the sensors on the supporting rod through driving the second motor, and storesdistance values, angle values of various sensors and corresponding reflection values of the sensors into a data sheet; and C. the step A and step B are repeated until all distance adjustments are finished. The device has the advantages of small volume, less power consumption and quick speed.