The invention relates to a check valve with a protective surface. The check valve is characterized in that a scraping assembly is arranged in check valve cavity; the scraping assembly comprises a stopblock, an auxiliary chamber, a telescopic sleeve, a scraper, a compression spring, a connecting plate, and a push rod; the auxiliary chamber has a hollow structure and is integrally arranged above avalve seat; the telescopic sleeve is vertically arranged in the auxiliary chamber; a hydraulic cavity is arranged in the telescopic sleeve; one end of the push rod is connected with the middle of a rocker in a hinged mode; the scraper is of a circular annular structure, and is arranged in the auxiliary chamber in parallel with the sealing surface of the valve seat; the connecting plate is of a flat plate type structure and is horizontally arranged; one end of the connecting plate is fixedly connected with the upper end of the scraper, and the other end of the connecting plate is fixedly connected with the upper end of the telescopic sleeve; the compression spring is vertically arranged above the connecting plate; and the compression spring can push the scraper obliquely downwards to enterthe cavity and scrape the medium adhered on the sealing surface of the valve seat. The check valve has the advantage that the medium does not adhere on the sealing surface of the valve seat.