An underground self-balance blowout control drip is applicable to oilfield underground pump inspection, workover treatment or pump operation in new well completion and commissioning. A rod cap is glidingly connected at an upper opening of an inner hole in the body, a screw-shaped ejector rod is arranged in a central hole of the rod cap, the ejector rod end is fixed with the upper bottom of a balance valve through a nut, two strip-shaped openings are formed on the wall of the balance valve, and a ring-shaped opening valve is connected at the lower end of the balance valve; a bypass hole is formed on the inner wall of the body, and a blowout control cap is fixed on a screw hole on the body wall; and a draining pin is fixed on the body wall. The underground self-balance blowout control drip has the beneficial effect that during well workover or pump operation after completion and commissioning of the new well, the maximum pressure differential inside and outside an oil pipe always keeps lower than 3MPa, so as to smoothly open the drip in case of pump bumping.