The invention relates to an anti-reflux continuous bladder irrigation liquid collection bag which comprises a drip cup and a collection bag body. The upper portion of the drip cup is connected with an anti-reflux mechanism through a second drainage tube, the anti-reflux mechanism comprises an outer cylinder, an inner cylinder, a partition plate and a movable plug, an inlet and an outlet are formed in the upper end and the lower end of the outer cylinder respectively, the outlet is hermetically connected with the upper end of the second drainage tube, the bowl-shaped partition plate is arranged in the outer cylinder below the inlet, the upper end of the partition plate is fixed to the inner wall of the outer cylinder, an overflowing hole is formed in a central zone of the partition plate, the movable plug is arranged below the partition plate, a sealing column matched with the overflowing hole is arranged at the top of the movable plug, the movable plug is clamped in the inner cylinder, the inner cylinder is arranged in the middle of the outer cylinder, a liquid outlet channel is formed between the inner cylinder and the outer cylinder, an inlet of the liquid outlet channel is arranged on the upper side of the inner cylinder, a collection cylinder is mounted at the bottom of the movable plug, the lower end of the collection cylinder is open and positioned on the upper side of the outlet, and a sterilizing layer is arranged on the inner side of the collection bag body. Irrigation liquid can be prevented from reflux in accidental action by the anti-reflux mechanism, so that use safety of a patient is protected.