The invention provides a method and device for acquiring a data packet delay time. The method comprises the following steps: a sending end sends a first combined hash value of a sent data packet and a compression timestamp corresponding to the data packet to a receiving end; the receiving end receives and restores the compression timestamp, and calculates a second combined hash value of the received data packet according to the received data packet; and when the first combined hash value is equal to the second combined hash value, the receiving end acquires a delay time of the data packet based on a sending timestamp and a receiving timestamp. By adoption of the method and device provided by the invention, the efficiency of measuring the data packet delay time is improved.