Insulin injection pen

The utility model discloses an insulin injection pen, which is characterized in that a timing device is arranged on the outer wall of a pen body, the timing device starts timing after insulin injection is finished, and the timing device can give an alarm to remind an operator when the timing reaches the set time, so that the operator is prevented from pulling out a needle too early, and the insulin injection effect is ensured. Moreover, after the insulin pen is pulled out from the subcutaneous part of a patient, the needle taking seat is slid until one end of the needle taking seat extends out of the pen cap, the needle head is inserted into the dismounting head, the convex strip is clamped into the groove in the needle head, the pen body is rotated, the needle head is separated from the pen body, and then the needle taking seat is slid into the pen cap until the needle head abuts against the top of the pen cap and is ejected out of the needle taking seat. And the needle head can smoothly fall into a designat