Log recording method and log recording device

The invention provides a log recording method and a log recording device, which are used for acquiring and recording abnormal information generated in the running process of an embedded system, and the log recording method comprises the following steps: monitoring data of at least one key variable of the embedded system in real time, and recording the data of at least one key variable of the embedded system; monitoring the running state of an operating system in the embedded system in real time; judging whether the key variable and/or the operating system are/is abnormal or not, and if yes, recording abnormal information of the key variable or abnormal information of the operating system in a log file. According to the technical scheme, the information recorded in the log file can accurately and effectively reflect the state of each part of the embedded system in the operation process, and favorable support is provided for system development, debugging and fault analysis and elimination. 本申请提供一种日志记录方法及日志记录装置，