Based on the raw material boric acid, n-butyl alcohol, ethylene alcohol and tetraethylenepentamine, one kind of new organic amine boron crosslinker AB-1 is prepared to specify to hydroxyl alcohols fracturing fluid system. The optimal synthesis progress of crosslinker is determined, and some influence factors of the synthesis progress are also studied. The results have proved that: the first step--esterfication reaction, the mass fraction of boron acid is 15%, ethylene alcohol is 35%, n-butyl alcohol is 25%, under 120℃ for one hour; the second step--complexation reaction, tetraethylenepentamine is 10%, pentaerythritol is 5%, sodium hydroxide is 5~10%, under 150℃ for two hours; then crosslinker AB-1 is collected. The behavior evaluation results of fracturing fluid have proved that: hydroxypropal guar gum can be crosslinked with crosslink agent AB-1 with favorable delay crosslinking behavior, shear and temperature resistance behavior, solid-carrying behavior and gel breaking behavior.