The invention discloses multifunctional enzyme gene HG27 and application. The multifunctional enzyme gene HG27 comprises the following steps of comparing a nucleic acid sequence spliced by rhizomys sinensis intestinal microbe macro transcriptome with a glucoside hydrolase family, screening a sequence with relatively high homology, removing original signal peptide, adding pig parotid gland secretory protein signal peptide, optimizing a pig codon, and connecting to a pcd3.1 vector; transfecting to porcine kidney epithelial cells for expression verification, collecting a cell culture solution for enzyme activity analysis, comparing the enzyme activity, selecting the optimal HG27 gene, and detecting the optimal pH value, protein tolerance and enzymatic reaction of different substrates of the HG27 gene, thereby obtaining the multifunctional enzyme gene HG27 which can be applied to the fields of livestock and poultry feed enzyme preparations, transgenic animal preparation, food and medicine industries and the like, and the problems that cellulose is difficult to degrade and absorb and excrement pollutes the environment are solved.