The invention relates to a quick connection joint of a drill pipe, which is composed of an outer casing, an O-ring and an inner casing, and the inner and outer casings are sealed by an O-ring; The outer casing thread and flat groove are provided on the pipe wall, the inner casing thread, the inner casing sealing groove and the inner casing stopper with an axial stopper at the lower end are provided on the inner casing, and the inner casing thread and the outer casing thread are respectively used for Connecting the upper and lower drill pipes; the order in which the joint of the present invention is connected to the drill pipes is the lower drill pipe, the outer casing, the inner casing and the upper drill pipe. When the inner and outer casings are connected, the side contact of the inner and outer casing stoppers is formed to bear the transmission torque; the axial stopper is in contact with the end face of the outer casing stopper, so that the inner and outer casings cannot be axially pulled apart, and is used to withstand the lifting of the drill when the axial tension. The joint of the invention has the advantages of compact structure, good sealing performance, long service life, convenient and fast installation and disassembly, and is especially suitable for use on small-sized and portable geological exploration sampling drilling rigs.