The invention relates to a methyl amphetamine molecule identification sensitive chip for a sensor and a preparation method thereof. The methyl amphetamine molecule identification sensitive chip sequentially comprises a methyl amphetamine molecular engram polymer membranous layer and a metal membrane-base bottom layer from top to bottom, wherein the metal membrane-base bottom layer is realized by plating a layer of metal membrane on an optical microscopic glass by a vacuum vapor deposition method or a sputtering method, while the methyl amphetamine molecular engram polymer membranous layer is cross linked on the metal membrane surface of the metal membrane-base by a chemosynthesis method. A three-dimensional cavity which is provided with multiple action sites and is matched with the methyl amphetamine molecule in space and combination site is formed in the polymer membrane structure, thus the specificity and the high sensitivity of the methyl amphetamine molecule can be identified. The methyl amphetamine molecule identification sensitive chip has the remarkable advantages of stable physico chemical property, multiple reusage, easy storage, simple production method, less energy consumption, low cost, and the like.