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 movement sensor and an adjustable fixing assembly. The casing includes a through hole for the injection pen passing through. The circuit board module is disposed at the casing. The optical sensor is disposed at the casing and electrically connected to the circuit board module for detecting at least one of value on the dial gauge and a position of the press button. The movement sensor is disposed at the casing and electrically connected to the circuit board module for detecting rotating vibration of the wheel and rotating state of the injection pen. The adjustable fixing assembly is disposed at the casing for fixing the casing to the injection pen. A dose recording method is further provided.一種劑量紀錄裝置，適於可拆卸地套設在注射筆。注射筆包括轉輪、連動於轉輪的刻度錶及按鈕。劑量紀錄裝置包括殼體、電路板模組、至少一光學感測器、運動感測器及可調式固定組件。殼體包括穿孔，適於供注射筆穿設。電路板模組配置於殼體。光學感測器配置於殼體且電性連接於電路板模組，光學感測器適於偵測刻度表上的數值與按鈕的位置的至少一者。運動感測器配置於殼體且電性連接於電路板模組，運動感測器適於偵測轉輪在轉動時的震動與注射筆的翻轉狀態。可調式固定組件配置於殼體，且適於將殼體固定於注射筆。本發明提供一種劑量紀錄方法。
