Microwave digestion instrument with metering function

The utility model relates to the technical field of microwave digestion instruments, and discloses a microwave digestion instrument with a metering function, which comprises a box body, the outer wall of the box body is fixedly connected with a metering device, the outer wall of the box body is rotatably connected with a closing door, the bottom of the inner wall of the box body is slidably connected with a lifting plate, and the lifting plate is fixedly connected with the metering device. The inner wall of the top of the lifting plate is slidably connected with a sliding plate, and the inner wall of the sliding plate is rotatably connected with a rotating disc. The bottom of the digestion tube is placed at the top cambered surface openings of the clamping pieces, and the digestion tube is moved downwards, so that the cambered surface is expanded by the digestion tube, the two clamping pieces are driven to move towards the two sides of the fixed cabin, and when the digestion tube enters the inner wall of the