Oil leakage prevention device used when sucker rod breaks off

The utility model provides an oil leakage prevention device used when a sucker rod breaks off. The device comprises a device body, an annular connector, a side connection section and an elastic sealing portion, wherein the device body is provided with a guide hole in the vertical direction, the sucker rod can be arranged in the guide hole in a penetrating mode, and the inner diameter of the guide hole is matched with the outer diameter of the sucker rod; the annular connector is connected to the bottom end of the device body, the inner wall face of the annular connector is provided with a thread, and an inner annular cavity of the annular connector and the guide hole are communicated and are coaxially arranged; the side connection section is horizontally arranged, the inner end of the side connection section is connected to the side wall of one side of the device body, the side connection section is internally provided with a guide groove in the horizontal direction, the inner end of the guide groove is commu