Method for protecting JTAG (Joint Test Action Group) port of automobile central gateway

The invention relates to the technical field of central gateway ports, and discloses a method for protecting a JTAG port of an automobile central gateway, after the automobile central gateway is powered on, whether the JTAG port is in an open state or not is judged, if not, the JTAG port is not allowed to be accessed, if yes, any access application to the JTAG port is allowed, and if not, the JTAG port is not allowed to be accessed. The central gateway sets protection mechanisms with three security levels for the JTAG port, and the protection mechanisms are I-level protection, II-level protection and III-level protection respectively. According to the method for protecting the JTAG port of the central gateway with three security levels, on the premise that the JTAG port is not removed, namely, the JTAG port is reserved, a software measure mode is adopted to carry out authority management, password management and the like to protect the JTAG port, so that the JTAG port can be safely managed, the advantages of