Abstract: A device and method for power loss protection in solid state drive are provided. A power loss region is created in a flash memory array and reserved as an independent storage space for storing power loss backup. When the power is interrupted, the SSD halts the operation of the host. Before the backup power is used up, the buffered data is directly written to a blank power loss block of the power loss region to form a power loss backup, and an auxiliary mark is created for confirming the most updated power loss backup. After the power is resumed, the power loss backup is directly read from the power loss region according to the most updated power loss auxiliary mark of the power loss backup to restore the original state of the SSD before the power is interrupted.