Polish rod anti-blowout sealing device

The utility model provides a polish rod anti-blowout sealing device which is composed of a sealing pin 1, a guide sleeve 2, a spring 3, a back cap 4, a positioning pin 5, an abrasion-proof sleeve 6, a bearing 7, a pressing cap 8, and a polish-rod sealing device 9. The utility model adopts the structure that the lateral face of the polish-rod sealing device is provided with the sealing pin which is orderly connected with the guide sleeve and the back cap; the spring is clamped between the sealing pin and the back cap; the abrasion-proof sleeve is fixed on an outer ring of the bearing; the abrasion-proof sleeve and the bearing are fixed on the sealing pin through the positioning pin. Therefore, the utility model greatly reduce the abrasion to the polish rod. When the polish rod drops into a well, the sealing pin is inserted into the pressing cap under the action of spring force so as to realize automatic blowout prevention. The utility model has the advantages of reasonable design and simple structure, and is suitable for application on site.