The present invention relates to a method of producing an ADM collagen fiber, an ADM collagen fiber produced using the method, and an apparatus for producing the ADM collagen fiber. More particularly, the present invention relates to a method of producing an ADM collagen fiber including a step of extruding an acidic ADM collagen solution into a basic solution to form filaments. The present invention has an effect of providing a method of producing an ADM collagen fiber, an ADM collagen fiber produced using the method, and an apparatus for producing the ADM collagen fiber. According to the present invention, since a collagen solution raw material having a required concentration may be prepared by immediately pulverizing ADM collagen shells, economic efficiency and productivity may be increased through reduction in production cost and time. In addition, mass production is possible by using a continuous process apparatus with a simple structure.