The invention relates to a fault code, data stream and freeze frame data storage and playback method. The method includes the steps that first, fault code, data stream and freeze frame data are recorded in a data area of a memory; second, indexes of the fault code, data stream and freeze frame data are recorded in an index area of the memory; third, when the next record is made, the start address of the index area and the start address of the data area are recorded in a public area of the memory; fourth, when the data are played back, the index area is searched so as to correspondingly read out the data in the data area. According to the fault code, data stream and freeze frame data storage and playback method, through recording of a large amount of data of fault codes, data streams and freeze frames, professionals and car owners can reasonably analyze data of cars so as to judge the using states and the diagnosis problems of the cars, and thus professional analysis is obtained.