Order clustering method and device, and malicious information rejecting method and device

An order clustering method and device, and a malicious information rejecting method and device. The clustering method comprises: generating an order unique identifier and an order content according to order information (101); converting the order content into an order vector (102); and performing a clustering operation according to the order unique identifier and order vector, to obtain a result about which classified cluster the order belongs to (103). After the clustering, whether the classified cluster is a classified cluster of malicious information can also be obtained according to the order content in the classified cluster; and if so, then corresponding processing is performed on all the orders in the entire classified cluster. By means of the methods and devices, an order in an electronic transaction can be classified automatically, a new classification can be obtained according to real-time content analysis of the order, and unified processing can be performed on all the orders in the entire classified cluster at one time, thereby improving the efficiency of rejecting malicious information.