Abstract: To solve the efficiency problem of the existing malicious node detection methods in wireless sensor networks (WSN),a malicious node detection model was proposed based on enhanced low energy adaptive clustering hierarchy (LEACH) routing protocol with reputation (MNDELR).Firstly,in wireless sensor network,the enhanced LEACH routing protocol was used to select the cluster-head nodes and make other nodes to be corresponding cluster-head nodes to form the clusters and determine the packets delivery paths in the network.Then,some information,including the node numbers and the reputation evaluation,were added to the data packets of nodes,and the data packets were sent to the sink node according to the delivery paths.The node numbers in the packets were parsed and compared with the source node numbers in the convergent node to form a list of suspicious nodes.Finally,the reputation values of the nodes were calculated and compared with the threshold to determine the malicious nodes in the network.The experiment results show that,compared with other methods,MNDELR model can detect malicious nodes in WSN more effectively.