The invention discloses a breather valve field verification device and a use method thereof. The device comprises a test tube, a blind plate, a transverse tube, a vertical tube, a connecting tube group and a control valve group; a flange matching a connecting port of a to-be-verified breather valve is mounted at the top end of the test tube; the blind plate is mounted at the bottom end of the test tube; the inner diameter of the test tube is identical with that of a connecting end of the to-be-verified breather valve; an air source/water source connecting tube is mounted at the upper end of the test tube, and an air source/water source control valve is mounted on the connecting tube; the transverse tube is mounted at the lower end of the test tube, and a transverse tube control valve is mounted on the transverse tube; the transverse tube is communicated with the vertical tube, the vertical tube is provided with scale values, and a vertical tube control valve is mounted at the top of the vertical tube; and a drainage connecting tube is mounted at the bottom of the test tube, and a drainage control valve is mounted on the drainage connecting tube. The device disclosed by the invention is simple in structure, convenient to operate and high in measurement accuracy, and saves detection time and cost.