The invention provides a medical drainage device. The medical drainage device comprises a drainage device body and a supporting frame. An installing frame is arranged on the supporting frame, and the drainage device body is arranged on the installing frame; the supporting frame comprises universal wheels, supporting arms, a supporting cylinder and a supporting base, and the supporting arms are evenly arranged on the supporting base. According to the medical drainage device, braking devices are arranged on the universal wheels on the drainage device, and in this way, the drainage device can be fixed through the braking devices when the drainage device does not need to move; the braking devices are connected with an adjusting disc, as the adjusting disc suffers from the effect of a lifting column, the tightness degrees of the braking devices are controlled by connecting lines, and control over the whole drainage device is achieved accordingly; in this way, when patients use the drainage device, the drainage device can also be well fixed while the drainage device is convenient to move; occurrence of accidents caused when other persons accidentally impact the drainage device is prevented, and the life safety of the patients is effectively guaranteed.