The invention belongs to the technical field of medical instruments, and particularly relates to a bloodletting device specially used for Mongolian medicine bloodletting therapy. A manner of opened bloodletting is adopted by a conventional bloodletting device, infection and contamination are easily caused by the opened bloodletting manner, blood which is let out is not quantified, treatment and diagnosis are affected, the bloodletting amount cannot be easily controlled, cruor in advance is easily caused, repeated puncturing is needed, and the treatment effect is affected resulting in the burden of a patient. The bloodletting device comprises a puncture needle, the puncture needle comprises a needle body and a needle handle, a valve is arranged in the middle of the needle handle, the valveis provided with a leading pipe, and the rear end of the leading pipe is connected with a draining bag. The draining bag comprises clamping plates and a side enclosure, and the clamping plates are provided with control adjusting devices. The bloodletting device is simple in structure and easy to use, the treatment process is fully closed and has no contamination and infection, the draining bag with a special structure is adopted, the draining bag is provided with two transparent clamping plates which are oppositely arranged to make the observation of bloodletting convenient, the bloodletting speed of bloodletting amount is controlled by matching with the valve, and a flexible bloodletting treatment scheme can be achieved.