The invention provides a coproduction process for extracting various bioactivators from pig placenta, which comprises the following steps: taking the pig placenta (containing farrowing blood) as a raw material, utilizing components rich in the raw material such as immune globulin (Ig), immunocompetent peptide, superoxide dismutase (SOD), lipopolysaccharide, placental protein and the like, and applying modern biochemistry technology and biological integration technology such as salting in, salting out, chromatography, ultra-filtration and the like according to different structures, molecular weights, isoelectric points, physical and chemical properties, biological activities of the components to make the coproduction process suitable for industrial production. Therefore, in the same flow of the production process, the effective components in the pig placenta with market development value can be produced, namely five products of the immune globulin, the immunocompetent peptide, the superoxide dismutase, the lipopolysaccharide and the placental protein. The process combines the conventional and modern processes, produces various products through coproduction, and not only makes full use of placenta resources to change the waste into the treasure, does not discharge waste liquid and prevents the environment, but also can greatly reduce the production cost and improve the economic benefit.