Safety valve with high sealing property

The invention relates to a safety valve with high sealing property. The safety valve comprises a valve body, a valve cover, a pressure rod, a pressure cover, a spring and a sealing pad, wherein the valve cover comprises a main body part, an ejector part and a punching part which are integrated; the main body part and the ejector part are cylindrical structures; the ejector part is a tapered structure; a sealing pad fixing cavity is formed in the valve cover; the sealing pad comprises a first sealing pad and a second sealing pad; the first sealing pad is fixed on the valve cover; a ring of third convex ribs is arranged on the first sealing pad; the second sealing pad is fixed in the first sealing pad in an interference fit mode; a second lug is arranged on the second sealing pad; a sealing cavity which is of a circular ring shaped structure is formed between the second bump and the third convex ribs; the sealing cavity is in clearance fit with a second convex rib; a pressure rod channel is arranged on the pressure cover; the pressure rod is fixed at one end of the valve cover through a bolt; the spring is arranged on the outer part of the pressure rod in a sleeving mode; and the pressure rod penetrates through the pressure cover, so that the spring is fixed between the valve cover and the pressure cover. The safety valve is simple in structure, good in sealing property and relatively safe and reliable.