Abstract: The present invention discloses an ASN.1 protocol processor for protocol interacting between the server and client and transformation between protocol data and byte stream data, comprising: a protocol data description module in which ASN.1 protocol is integrated and a protocol procedure module in which protocol procedure codes are integrated; wherein the protocol data description module stores ASN.1 protocol description information which is described by the eXtensible Markup Language (XML) and ASN.1 protocol data which are required by the protocol procedure and set according to the description information; and the protocol procedure module performs protocol interaction and protocol transformation based on the protocol procedure according to the information in the protocol data description module. An ASN.1 protocol processing method is also disclosed.