Bionic shale inhibitor and its preparation method and its application drilling fluid

The present invention discloses a biomimetic shale inhibitor, the inhibitor is composed of shale biomimetic structural unit represented by the formula (1) and a structural unit represented by the formula (2), wherein the formula (1) shown in the structure (2) the molar ratio of the structural units of the formula units and 0.2-6: 1; the weight average molecular weight of shale inhibitor 800-4000g / mol. The present invention also provides a method for preparing biomimetic shale inhibitors, and was prepared by this method bionic shale inhibitor. The present invention further provides a drilling fluid and its application contains the above bionic shale inhibitor. Bionic shale inhibitor of the present invention to shale inhibition properties and high environmental pollution.