The invention discloses a unified log component, which is used for managing a log file of an application, and realizes the following contents: 1) trace Id is acquired and outputted to the log file, and tracking a whole calling link according to the trace Id; 2) the log component comprises a log configuration file in a unified log format and is used for outputting the log file in a unified format;and 3) the change of the log configuration of the application is monitored by the log component, and correspondingly adjusting the log file according to a change item. According to the log component,the log file of the application can be conveniently managed. A whole calling link can be tracked according to the trace Id; the log file of the unified format is generated so that data statistical analysis is facilitated. Dynamic log level adjustment is achieved, revision searchability and safety are achieved through the log assembly, the log assembly can be more conveniently configured through the management platform, the use safety of the log component is improved, and the log files possibly influencing the application performance are monitored. The existing application is easy to access, and configuration and monitoring management of the log file are realized.