▎ 摘　　要

NOVELTY - The utility model belongs to the technical field of biological medical appliance, especially a nucleic acid purifying suction head, comprising a suction head, the inner bottom end of the suction head is provided with a filler, the top end of the outer side of the suction head is provided with a convex strip, the filler is divided into two types, one type is nucleic acid adsorbent porous film, can be silica gel film, glass fiber, silicon dioxide nano material, graphene the other type is quartz cotton. The utility model is provided with a suction head and a filler, which can reach the advantages of simple structure, easy preparation, strong function, economical and practical. it can be used for plasmid extraction, DNA purification, gel and so on, also can be used for purification and recovery of large fragment genome.