The invention discloses an oil sucking machine wellhead sealing device, which structurally comprises a sealing device, a steel wire, a ass head, a pulling frame, a rotating disc, a rotating post, a base, a support frame, an arc-shaped baffle plate, a sliding frame, a sliding block, a protection pad, a flow division pipe, a flow division passage, a rubber pad, a locking device and an installing frame, wherein the installing frame is fixedly arranged at the left and right sides of the sliding block and is mechanically connected with the sliding block; the sliding block is arranged at the inner side surface of the sliding frame and is matched with the sliding frame; the flow division pipe and the flow division passage are of an integral structure; the flow division passage is arranged insidethe installing frame; the rubber pad is positioned on the upper surface of the installing frame and is mechanically connected with the installing frame. The oil sucking machine wellhead sealing deviceprovided by the invention has the advantage that the goals of reducing the impact pressure of the oil pressure inside the device on the device in the sealing process and flowing out oil overflowing in the device in a flow division way so that the sealing of the device is more complete can be achieved.