Sample grinding device capable of providing stable force application

The utility model relates to the technical field of sample grinding, in particular to a sample grinding device providing stable force application, which comprises a grinding machine and a mounting cover, a grinding rod is arranged on the top of the mounting cover along the vertical direction, and a grinding head is connected to the bottom of the grinding rod along the horizontal direction. A sample needing to be ground adheres to the end, away from the grinding rod, of the grinding head, a grinding disc is installed in the grinding machine in the horizontal direction, a rotating shaft is fixedly connected to the bottom of the grinding disc in the vertical direction, and the end, away from the grinding disc, of the rotating shaft extends out of the bottom of the grinding machine. And the extending part of the grinding disc is connected with a rotating motor, the rotating motor is used for driving the rotating shaft to rotate, and the grinding disc and the grinding head are used for clamping and positioning a s