A dose recording device adapted to be detachably sleeved on an injection pen having a wheel, a dial gauge and a press button both linked with the wheel is provided. The dose recording device includes a casing, a circuit board module, at least one optical sensor, a motion sensor and an adjustable fixing assembly. The casing includes a through hole for the injection pen passing through. The optical sensor is electrically connected to the circuit board module for detecting at least one of a value on the dial gauge and a position of the press button. The motion sensor is electrically connected to the circuit board module for detecting rotating vibration of the wheel and inversion state of the injection pen. The adjustable fixing assembly is for fixing the casing to the injection pen. A dose recording method is further provided.
