A blood pump is provided, which includes a pump body. The pump body includes a pump casing, a driving unit, and an atraumatic ring. A proximal end of the pump casing is provided with a liquid inlet. A distal end of the pump casing is open to define the distal end of the pump casing as a liquid outlet, and a central axis of the pump casing passes through the liquid outlet. The driving unit is fixedly connected to the proximal end of the pump casing, and is configured to drive blood to flow from the liquid inlet to the liquid outlet. The atraumatic ring is disposed around a peripheral edge of the liquid outlet. A radial thickness of the atraumatic ring is greater than a wall thickness of the pump casing.