Underground coal sample particle size fine separation device

The utility model relates to the technical field of particle size fine separation devices, and discloses an underground coal sample particle size fine separation device which comprises a main body mechanism, a transmission mechanism and an auxiliary mechanism, the transmission mechanism is located on the right side of the main body mechanism, and the auxiliary mechanism is located outside the main body mechanism. The main body mechanism comprises a first containing groove, a first filtering hole, a second containing groove, a second filtering hole, a third containing groove and a third filtering hole, the first filtering hole is fixedly formed in the inner end of the first containing groove, the second containing groove is fixedly installed below the first containing groove, the second filtering hole is fixedly formed in the inner end of the second containing groove, and the third filtering hole is fixedly formed in the inner end of the third containing groove. And the third containing groove is fixedly insta