A pipe joint structure comprises a pipe joint body which leads two tube bodies to be fixedly connected, wherein two sides of a tube body receiving space of the pipe joint body are respectively provided with a slot; two sides of the slot are extensively provided with a pivot seat; the bottom end of the pivot seat is extensively provided with a buckling seat; a buckling handle is pivoted in the pivot seat through a fixed member, so the buckling handle rotates to actuate on the pivot seat; a shifting handle is pivoted in the buckling handle, so the shifting handle actuates elastically in the buckling handle through a reset element; and a pull ring penetrates through the shifting handle. When the buckling handle is buckled, a pressing part at the front end clamps towards the tube body receiving space, so as to clamp the tube bodies inserted in the body; the shifting handle is buckled and fixed with the buckling seat, so the buckling handle is not easily loosened; when the user reversely loosens the buckling handle, firstly the shifting handle is loosened on the buckling seat by applying force through the pull ring, then the buckling handle rotates to actuate, and finally the pressing part of the buckling handle is no longer clamped on the tube body, and the effect of simple and easy operation can be achieved.