The invention discloses an FPGA-based digital delay method and device. The method comprises the steps that the valid data of each pulse in phased array radar intermediate frequency signals are stored;and the valid data of the pulse are outputted for each pulse when the receiving duration of the pulse reaches the corresponding maximum delay value of the pulse. Only the valid data of the radar intermediate frequency signals are stored so that the storage space can be reduced, flexible configuration of the maximum delay value can be realized for each pulse and the delay change of each pulse canbe adapted.