The utility model belongs to the technical field of the gas experiment, concretely relates to moisture content controllable gas adsorption and desorption experiment coal sample grinding screen dividedevice, the loach carrying platform comprises a supporting fram, the machine case, driving motor and first belt, the machine incasement is equipped with rubbing crusher to be constructed, rubbing crusher constructs including upper left rotation axis, upper right rotation axis, a left side is rotation axis and right rotation axis down, upper left rotation axis is equipped with first roller, first roller is equipped with the first spike -tooth of multiseriate, left side rotation axis down is equipped with the second roller, the second roller is equipped with multiseriate second spike -tooth, radial evenly distributed is all followed to first spike -tooth of multiseriate and multiseriate second spike -tooth, epaxial first spike -tooth of upper left rotation axis and upper right rotation and second spike -tooth are crisscross each other, and contactless, crisscross depth dimension between epaxial first spike -tooth of upper left rotation axis and upper right rotation and the second spike -tooth is lighter than a left side first spike -tooth on rotation axis and the lower rotation axis in the right side and the crisscross depth dimension between the second spike -tooth down. It will smash and sieve collection in an organic whole, smash effect and the equal preferred of dust exhaust effect.