NOVELTY - Extracting heme comprises e.g. centrifugally separating the fresh pig blood, and collecting the pig blood cell, mixing the pig blood cell and water, stirring pig blood cell until breaking film, adding trypsinase for enzymolysis process, regulating pH, heating, centrifugally separating enzymolysis liquid and collecting precipitate, which is heme crude product, adding sodium hydroxide solution in heme crude product, heating, stirring, cooling solution, adding sodium carboxymethyl cellulose, carrying out centrifugal separation to obtaining sodium carboxymethyl cellulose-heme, and separating.    USE - The method is useful for extracting heme (claimed).    ADVANTAGE - The method does not require addition of any organic solvent, is safe and environmentally friendly, has simple and controllable production process, can extract product with purity more than 85%.    DETAILED DESCRIPTION - Extracting heme comprises (i) centrifugally separating the fresh pig blood, and collecting the pig blood cell, (ii) carrying out enzymatic hydrolysis to separate heme peptide: mixing the pig blood cell and water according to ratio, stirring pig blood cell until breaking film, then regulating temperature to 30-70 degrees C, maintaining pH at 4-9, then adding trypsinase for enzymolysis process for 6-24 hours, then regulating enzymolysis liquid pH to 4-9, heating to 50-90 degrees C, centrifugally separating the enzymolysis liquid and collecting precipitate, which is heme crude product, (iii) re-dissolving and absorbing heme peptide: adding sodium hydroxide solution in heme crude product, heating at 50-90 degrees C, stirring the heme crude product to dissolve, cooling solution, adding sodium carboxymethyl cellulose, stirring uniformly, subjecting sodium carboxymethyl cellulose-heme crude product for centrifugal separation, obtaining sodium carboxymethyl cellulose-heme, and (iv) separating sodium carboxymethyl cellulose-heme: using ultrafiltration film with molecular weight cutoff of 500-50000 Da to separate sodium carboxymethyl cellulose and heme, after ultra-filtration, taking retentate, and drying to obtain the heme.