A pressure balance type oil sealed plug valve, the plug is adjusted by the bolt in the lid of the valve, and the sealant inject the valve from the end of the stem; in order to prevent pressure from pushing the plug into the valve body, the end of the plug has a balance hole, and the balance hole in the small end of the valve has no medium only to the end of the small head. When entering the cavity at the two ends of the valve plug, the sealing of the valve is sealed by the sealant between the valve plug and the valve body.