The nutrient and heavy metal contents of biogas fertilizers from different biogas digester in the Gaoping city of Shanxi province were compared and analyzed.The results indicated that the pH of biogas fertilizers were all alkalinity.The organic matter,total N,total P,and total K contents in biogas slurry of chicken manure were higher than that in biogas slurry of pig manure and the organic matter and total K contents in biogas slurry of straw were higher than that in biogas slurry of chicken manure and pig manure.Biogas residue was rich in organic matter and the organic matter in biogas residue of straw was higher than that in biogas residue of pig manure.The total N was higher than total P and total K in biogas residue of pig manure and the total K was higher than total N and total P in biogas residue of straw.The ratio of available P to total P was the highest in the two kinds of biogas residue.The Cl concentration was the highest among the medium and trace elements and exceeded the farmland irrigation water quality standards(GB 5084-2005),then followed by Ca and Mg,and Cu content was lowest in the three kinds of biogas slurry.The Ca and Fe contents were higher among the medium and trace elements in the 6 biogas residues,and the Cl content was lower in the 3 biogas residues of pig manure，but the Mn and Cu contents were lower in the 3 biogas residues of straw.The As content exceed organic fertilizers standards（NY 525-2012)in the pig manure biogas residue of No1.Thus it could be seen that part of biogas slurry and residue might exist excessive harmful substances and that could affect its value and effect of agro-application and there was potential ecological environment risk.At the same time,the formulation and improvement of relevant standards should be strengthened for the safe and efficient agro-application of biogas fertilizer.