Identification of drug-disease association is crucial for drug development and reposition. However, discovering drugs which are associated with diseases from in vitro testing is costly and time-consuming. Accumulating evidence showed that computational approaches can complement biological and clinical experiments for this identification task. In this work, we propose a novel computational method Node2Bio for predicting drug-disease associations using a highly efficient biomolecular network representation model. Specifically, we first construct a large-scale biomolecular association network (BAN) by integrating the associations among drugs, diseases, proteins, miRNAs and lncRNAs. Then, the network embedding model node2vec is used to extract network behavior features of drug and disease nodes. Finally, the feature vectors are taken as inputs for the XGboost classifier to predict potential drug-disease associations. To evaluate the prediction performance of the proposed method, five-fold cross-validation tests are performed on a widely used SCMFDD-S dataset. The experimental results demonstrate that our method achieves competitive performance with a high AUC value of 0.8569, which suggests that our method is a useful tool for identification of drug-disease associations.