device 1 of the present embodiment follows the same operations of the injection pen 12 in the market such as rotating and pushing to complete the entire process of dose selection injection and drug information detection the drug information detection type injection device 1 not only can adjust and select a dose for drug injection but also can automatically detect and store the drug injected dose information and the injection time in order to provide an important diagnosis basis to the users and the doctors as shown in fig1 a connection sleeve 1211 is arranged at one end of the adjusting knob 121 an outer side of the connection sleeve 1211 is arranged with a screw thread the second end of the housing 112 is fixed to the connection sleeve 1211 through the screw thread that is the adjusting knob 121 and the housing 112 are fixed to each other through the connection sleeve 1211 an accommodating chamber is formed inside the connection sleeve 1211 and the housing 112 the rotary encoder 113 and the control assembly 114 are arranged in the accommodating chamber and fixed to the connection sleeve 1211 or the housing 112 such that the encoder body 1132 and the control assembly 114 can be driven to synchronously rotate with the adjusting knob 121 other circuit structures are arranged in the accommodating chamber as shown in fig2 the circuit structures.