Disclosed is a method for enhancing service quality of a solid state drive and the solid state drive, and the method includes the steps of obtaining a remaining storage resource corresponding to a write I/O request periodically, and determining a resource waiting time of the write I/O request based on a resource consumption rate of the write I/O request. The method also includes setting a maximum scheduling delay time for the write I/O request according to the resource waiting time of the write I/O request. The method also includes identifying a type of unprocessed I/O requests and obtaining an arrival time of the unprocessed I/O requests, and sorting the unprocessed I/O requests in combination with the maximum scheduling delay time. The method further includes processing the unprocessed I/O requests according to the sort of the unprocessed I/O requests.