Anti-disengaged perfusion needle driven by bag

The invention discloses an anti-disengaged perfusion needle driven by a bag. The needle comprises a sleeve, a fixing assembly is connected to the end of the sleeve, a needle core is arranged inside the sleeve, and a fixing assembly penetrates through the end of the tip of the needle core; the fixing assembly comprises a fixing card, a connecting part is arranged at one side of the fixing card, a puncture part is arranged at the other side of the fixing card, a water injection channel is further arranged inside the inner wall of the fixing assembly, an inlet of the water injection channel is formed in the connecting part and communicated with an injection guiding pipe, an outlet of the water injection channel is communicated with a fixing cavity formed in the side wall of the puncture part,the fixing cavity is connected with a movable piece through a rotating shaft, a bounce back piece is arranged on the inner side of the movable piece, an elastic bag is arranged at the position closeto an outlet of the water