High-precision powder sample preparation machine

The utility model relates to the technical field of sample preparation machines, and discloses a high-precision powder sample preparation machine which comprises a machine body, the machine body is of a square hollow structure, an air detection device is fixedly connected to the inner wall of the top of the machine body, and a first groove is formed in the inner wall of the side, close to the air detection device, of the machine body; a second groove is formed in the inner wall of the side, away from the air detection device, of the first groove. The air detection device can be used for detecting gas generated after sample matching is completed, when the gas is detected to be harmful gas, the electromagnet repels the magnetic block, so that the inserting block and the inserting groove are connected in an inserted mode, the machine body can be locked, and on the contrary, the electromagnet attracts the magnetic block, so that the machine body can be locked. And the inserting block is separated from the inserti