The utility model discloses a polish-rod clamp for rod-pumped wells. The clamp comprises an upper chuck (1), clamp teeth (3), a lower chuck (4) and auxiliary clamping blocks (5); and the clamp is characterized in that the polish-rod clamp for rod-pumped wells is of a cylindrical hollow structure, the center of the upper chuck (1) is provided with a through hole of a polish rod (9), the upper part of the upper chuck (1) is provided with a handling hole (2), the lower part of the upper chuck (1) is provided with an internal thread which is matched with an external thread of the lower chuck (4), two semi-cone-shaped clamp teeth (3) are arranged between the upper chuck (1) and the lower chuck (4), and tapered holes which are matched with the outsides of the clamp teeth (3) are arranged in two semicircular auxiliary clamping blocks (5). The clamp disclosed by the utility model is simple in structure, easy to install and safe in operation; and by using the clamp, the labor intensity of workers is reduced, the polish rod is clamped firmly, and a slipping phenomenon is uneasy to occur, thereby guaranteeing the normal production of an oil well.