Blood leakage sensor for direct dialysis machine

The utility model discloses a blood leakage sensor for a direct dialysis machine, and belongs to the technical field of medical instruments. Which comprises a light source and a color sensor, and is characterized in that a detection cylinder (3) is arranged, a fluid cavity (10) penetrating through a straight line is formed in the axis of the detection cylinder (3), an incident lens (6) and an emergent lens (11) are arranged at the light incident end and the light emergent end of the fluid cavity (10) respectively in a sealed mode, and the light source and the color sensor are detachably fixed to the incident lens (6) and the emergent lens (11) respectively; and a liquid inlet joint (4) and a liquid outlet joint (1) are hermetically mounted on the surface of the detection cylinder (3) and are respectively communicated with the fluid cavity (10). According to the blood leakage sensor for the direct dialysis machine, the liquid outlet connector and the liquid inlet connector are arranged, so that the blood leaka