A needle-free joint device comprises a casing and an elastic member, wherein two sides of the casing are respectively formed as a needle-free injection end and an output connection end, and the elastic member is located in the casing, and has a sequential contact a pressing portion, a pressed body and a pressure receiving seat, the top portion of the pressure receiving portion is recessed to form a concave portion, and the pressure receiving portion is formed as a hollow hemispherical structure, and is pressed when the needleless syringe is inserted from the needleless injection end When the pressure is applied, the pressure seat is recessed inward, and the liquid flow flowing out of the needleless syringe is subjected to the concave portion of the pressing portion and flows through the gap to the output connecting end, and when the needleless syringe stops pressing the pressure receiving portion, The pressure seat is ejected outward to return to its original shape.一種免針式接頭裝置，包含一殼體以及一彈性構件，殼體的二側分別形成為無針注射端及輸出連接端，而彈性構件位於殼體中，並具有依序相接的一受壓部、一受壓本體及一受壓座，受壓部之頂面向內凹陷形成有一凹部，以及受壓座形成為一中空半球結構，當無針注射器自無針注射端插入而對受壓部施壓時，受壓座向內凹入，且自無針注射器流出之液體流經受壓部之凹部並通過空隙往輸出連接端流動，當無針注射器停止對受壓部施壓時，受壓座向外彈出而恢復原狀。
