The present invention relates to a container fumigating drug dosing device. The device comprises a magnetic type feed mechanism arranged at the top portion of a container, a dosing device stretching into the container for dosing, a detection device stretching into the container to perform drug concentration detection and an automatic control mechanism configured to control the dosing device to start dosing or stop dosing; the magnetic type feed mechanism is absorbed at the inner wall surface of the container; the dosing device is connected with the magnetic type feed mechanism, and the magnetic type feed mechanism pushes drugs to the rear end of the container for dosing from the top portion; the detection device is connected with the dosing device to perform real-time monitoring of drug concentration at the front end of the container; and the automatic control mechanism is connected with the dosing device and the detection device to control on-off of the dosing device according to theinformation fed by the detection device. The container fumigating drug dosing device is convenient to perform rapid diffusion and uniform diffusion so as to achieve scientific and effective dosing andaccurately and dynamically monitor drug concentration in real time, achieve automatic dosing, avoid drug wasting and save human cost.