The invention relates to a specimen notch presser, comprising a base, a support board, a support sleeve, a press knife, a press rod, a pressure plate and a return spring, wherein the support plate is fixed on the base, the support sleeve vertical to the base is fixed on the support plate, the press rod penetrates through the support sleeve, of which the upper end is mounted with the pressure plate and the lower end is mounted with the press knife, the press rod between the support sleeve and the pressure plate is sheathed by the return spring, the press knife is provided with a V-shaped cutting edge which two sides are provided with a protruded stop platform. The press rod is mounted with a notch depth measurement percent meter via a meter support. The notch depth can be limited by the knife to reliably control the specimen notch depth in a standard range and can display real-time depth. The specimen notch presser has accurate pressed specimen notch depth, high notch press speed and improved working efficiency.