A pipe joint structure , comprising: a joint body ; a support seat , wherein a first end of the support seat is sleeved on outside of the joint body , a second end of the support seat is disposed to be separated from the joint body , and an accommodating cavity is defined between an inner wall of the support seat and an outer wall of the joint body ; a housing , wherein a first end of the housing is sleeved on outside of the support seat and engaged with the support seat , a second end of the housing is disposed beyond the second end of the support seat , so that a contraction cavity is defined between an inner wall of the housing and the outer wall of the joint body ; an insertion opening through which a pipe can be inserted is defined between the joint body and the second end of the housing , the insertion opening communicates with the accommodating cavity via the contraction cavity , an end of the contraction cavity close to the insertion opening is a small opening end, and the other end of the contraction cavity away from the insertion opening is a large opening end; and an elastic member , wherein the elastic member is sleeved on the outside of the joint body and disposed in the contraction cavity ; a passage through which the pipe can pass is defined between the elastic member and the joint body ; characterized in that an outer wall of the support seat is provided with a plurality of engagement grooves and guiding grooves , the engagement grooves are spaced apart along a circumferential direction of the support seat , the guiding grooves communicates with the engagement grooves respectively, and a side of each of the guiding grooves away from each of the engagement grooves penetrates through an end surface of the second end of the support seat ; a wall of the housing is provided with a plurality of engagement plates , and the engagement plates are capable of engaging with the engagement grooves through the guiding grooves . a joint body ; a support seat , wherein a first end of the support seat is sleeved on outside of the joint body , a second end of the support seat is disposed to be separated from the joint body , and an accommodating cavity is defined between an inner wall of the support seat and an outer wall of the joint body ; a housing , wherein a first end of the housing is sleeved on outside of the support seat and engaged with the support seat , a second end of the housing is disposed beyond the second end of the support seat , so that a contraction cavity is defined between an inner wall of the housing and the outer wall of the joint body ; an insertion opening through which a pipe can be inserted is defined between the joint body and the second end of the housing , the insertion opening communicates with the accommodating cavity via the contraction cavity , an end of the contraction cavity close to the insertion opening is a small opening end, and the other end of the contraction cavity away from the insertion opening is a large opening end; and an elastic member , wherein the elastic member is sleeved on the outside of the joint body and disposed in the contraction cavity ; a passage through which the pipe can pass is defined between the elastic member and the joint body ; characterized in that an outer wall of the support seat is provided with a plurality of engagement grooves and guiding grooves , the engagement grooves are spaced apart along a circumferential direction of the support seat , the guiding grooves communicates with the engagement grooves respectively, and a side of each of the guiding grooves away from each of the engagement grooves penetrates through an end surface of the second end of the support seat ; a wall of the housing is provided with a plurality of engagement plates , and the engagement plates are capable of engaging with the engagement grooves through the guiding grooves . <EOS>