The invention relates to a crystal form of a pyrazoloheteroaryl derivative and a preparation method thereof, in particular to a crystal form A, a crystal form B, a crystal form C, a crystal form D, acrystal form E, a crystal form F, a crystal form G, and a crystal form H of 6-butyloxy-1-(4-(pyrrolidin-1-group-methyl)-benzyl)-IH-pyrazolo[3,4-d]pyrimidin-4-amine and a preparation method thereof. The crystal form of the compound of formula (I) is good in crystal form stability and can be better used in clinical treatment.