The invention discloses a transformer winding turns ratio tester automatic precision verification device and a verification method, and aims to solve the problems in the prior art that an existing transformer turns ratio tester verification device is complex in operations, high in error rate, and incontinuous in turns ratio test verification. The transformer winding turns ratio tester and a square-type iron core are provided; a verification winding is arranged on the square-type iron core; a screw rod support and a screw rod are arranged outside the verification winding; a screw rod nut is connected with a slide plate; an upper verification winding (22) initial end (20), an upper verification winding (22) tail end (21), a lower verification winding (23) initial end (11), and a lower verification winding (23) tail end (12) are respectively electrically connected with the transformer winding turns ratio tester. The transformer winding turns ratio tester verification device can automatically, continuously and precisely verify the transformer winding turns ratio tester, is simple in operations, and easy to realize.