An SSD-based log data storage method includes: configuring metadata in a running state in log data to be continuously stored in a memory physical address of an SSD; dividing a preset number of buffers for an area where the metadata is continuously stored in the memory physical address; storing update data of the metadata generated during a reading-writing process according to the preset cyclic sequence; defining a mapping table of a memory logical address and a physical address of the log data; in response to the full storage of one buffer, executing an NAND writing operation on data in the buffer region, executing a preset length of NAND writing operation on metadata not written into a NAND in the SSD; in response to the completion of the NAND writing operation, ranking the corresponding buffer last in the preset cyclic sequence and waiting to store the update data of the metadata.