Processing method and device for network information and establishing method and device for abstract syntax tree

The invention provides a processing method and device for network information and an establishing method and device for an abstract syntax tree. The processing method for the network information comprises the steps of loading corresponding field information in the network information to be detected according to feature information described by nodes in the abstract syntax tree, wherein all nodes in the abstract syntax tree are used for describing the feature information of illegal commodity information; according to the loaded field information, judging whether statements corresponding to the nodes in the abstract syntax tree are true or not; if the statements corresponding to the nodes in the abstract syntax tree are true, judging the network information to be detected to be the illegal commodity information. According to the technical scheme, the problem that the processing efficiency of illegal commodities issued in electronic trading platforms is low in the prior art is solved, and the efficiency of processing of the illegal commodities is improved.