The utility model belongs to the technical field of the gas experiment, concretely relates to gas adsorption and desorption experiment coal sample grinding screen divide device, the loach carrying platform comprises a supporting fram, the machine case, driving motor and first belt, the machine incasement is established rubbing crusher and is constructed, rubbing crusher constructs including upperpair roller and lower floor's pair roller, the upper strata pair roller includes that two are gone up the rotation axis, it has last crushing roller to go up rotation axis integrated into one piece, the left end of going up the rotation axis passes quick -witted case and installs first driving wheel and second from the driving wheel of following respectively, lower floor's pair roller includes twolower rotation axises, rotation axis integrated into one piece has lower crushing roller down, the left end of rotation axis passes quick -witted case and installs drive wheel and third from drivingwheel respectively down, driving motor's power take off end is connected with the drive wheel transmission, a belt tensioning is on first follow driving wheel and drive wheel, first follow driving wheel and second are driven to take turns to the tensioning around being equipped with the second belt, drive wheel and third are driven to take turns to the tensioning around being equipped with the third belt. It will smash and sieve collection in an organic whole, smash effect, screening effect and the equal preferred of dust exhaust effect.