Sample collection bag for blood transfusion department

The utility model discloses a sample collection bag for blood transfusion department, which comprises a plurality of collection bag bodies, the top of each collection bag body is provided with an injection pipe, the bottom of each collection bag body is provided with a liquid outlet pipe, the injection pipes are connected with a multi-way valve, the outer sides of the plurality of collection bag bodies are wrapped with a protection bag, the top of the protection bag is provided with an inlet, and the liquid outlet pipe is connected with the multi-way valve. A plurality of outlets are formed in the bottom of the protection bag, sealing structures are arranged at the outlets, the outlets are matched with the collection bag body, a limiting structure is arranged at the inlet of the protection bag and comprises a first cover and a second cover matched with the first cover, and the first cover and the second cover are connected through a fixing structure. A plurality of first limiting blocks are connected into the