An ejector pin type valve mechanism capable of preventing eccentric wear of an air valve comprises a rocker arm, a rotating shaft, an air valve rod, an air valve head, an ejector pin structure, a structure seat and an air valve guide, wherein the ejector pin mechanism comprises a pin valve body, a pin valve and an elastic material; the pin valve body comprises an upper valve body and a lower valve body; the outer end of the rocker arm is in jacking-up movement fit with a jacking device; the inner end of the rocker arm is in pressing-down movement fit with the air valve head via the ejector pin structure and the air valve rod; the air valve rod moves up and down along the air valve guide which sleeves the air valve rod; a spring seat and a spring are connected with the bottom of the structure seat to provide a restoring force for the air valve rod; and an external thread can be arranged on the outer wall of the air valve guide to hold lubricating oil. The ejector pin type valve mechanism can not only avoid eccentric wear of the air valve and improve the assembly efficiency, but also automatically realize cycle operation of the air valve rod and improve the transfer efficiency.