The invention provides a FIFO memory and a data transmission method thereof, which relate to the technical field of memory. The FIFO memory comprises a controller, and a random access memory, a firstcounter, a second counter and a third counter respectively connected with the controller. the FIFO memory further comprises at least three triggers in series; Wherein each of the trigger is also connected to the random access memory and the controller, respectively. The invention can effectively shorten the delay time from data writing to data output of the FIFO memory.