The invention relates to a scalpel for the cardiovascular medicine department. The scalpel comprises a scalpel body, and the scalpel body is connected with a functional part capable of sucking liquid;the functional part comprises a suction head, a main body tube and a pressing device, one end of the main body tube is communicated with the suction head, and the other end of the main body tube is connected with the pressing device; the wall of the upper end surface of the main body tube is provided with a first one-way valve which can only allow air flow to flow from the interior of the main body tube to the exterior of the main body tube, and the main body tube is internally provided with a second one-way valve which can only allow external air flow or liquid flow to enter the main body tube; the upper end of a pressing part is provided with an elastic compression part protruding upwards. The scalpel is ingenious in structural arrangement, the components interact with one another, thefunctions of the scalpel are comprehensive, and a synergistic effect is achieved on operations.