The invention relates to the technical field of medical drug delivery devices, and discloses an injection pen. The injection pen includes an injection pen cover cap and an injection pen body, and the injection pen cap has a display window on it, and the inside of the injection pen cap is provided with a pushing member, a rotating member and an elastic member, and the pushing member sliding tracks are disposed inside the injection pen cap; the rotating member abuts against the pushing member, the rotating member is provided with prompt marks; one end of the elastic member abuts against the rotating member, and the other end is opposite to the inner wall of the injection pen cap; The prompt mark is displayed in the display window when the injection pen body inserts into or slide out of the injection pen cap. The invention realizes different injection information for reminding the patient by loading or removing the injection pen cap body from the pen cap. The internal parts of the injection pen cap are all mechanical parts, are not easy to be corroded, easy to disinfect, simple in operation and low in price.本發明涉及醫用藥物輸送裝置技術領域,公開一種注射筆。其中注射筆包括注射筆蓋和注射筆本體,所述注射筆蓋上設置有顯示視窗,所述注射筆蓋內設置有推動件、旋轉件和彈性件,所述推動件滑動設置在所述注射筆蓋內部;所述旋轉件與所述推動件相抵接,所述旋轉件上設置有提示標記;所述彈性件一端與所述旋轉件相抵接,另一端與所述注射筆蓋內壁相抵接;當注射筆本體伸入或脫出所述注射筆蓋時,所述提示標記顯示在所述顯示視窗內。本發明通過將注射筆蓋裝入或取下注射筆本體的動作來實現提醒患者不同的注射資訊,注射筆蓋內部的零件結構全為機械零件,不易腐蝕,容易消毒,操作簡單,價格便宜。