A jaw assembly of biopsy forceps, comprising: a jaw base, a first jaw, a second jaw, a limiting element, a pulling member, and a shaft member, the jaw base comprising a hollow tube, a first arm, and a second arm, which are integrally formed, the first arm and the second arm standing oppositely at a front end of the hollow tube, and an elongated slot between the first arm and the second arm for accommodating the first jaw and the second jaw, the pulling member extending along a cavity of the hollow tube; the first jaw and the second jaw being openable and closeable, and are movably arranged in the elongated slot of the jaw base; a rear end of the first jaw and a rear end of the second jaw being relatively rotatably connected with a front end of the pulling member, and the pulling member extends rearward within the cavity of the hollow tube, wherein the jaw assembly of biopsy forceps further includes a sampling needle, the limiting element is arranged between the first jaw and the second jaw, two ends of the limiting element are respectively fixed to the first arm and the second arm, and the limiting element is configured to limit a maximum stroke of the pulling member pushing forward; the first jaw and the second jaw are individually provided with a ramp for being matched with the limiting element to open or close the first jaw and the second jaw, the rear end of the first jaw, the rear end of the second jaw, and a front end of the pulling member are riveted by the shaft member; and the pulling member includes a pull rod, an annular connecting portion is arranged at a front end of the pull rod, and the shaft member penetrates through the annular connecting portion to realize riveting of the pulling member with the first jaw and the second jaw, characterized in that: a rear end of the sampling needle is fixed to the middle of the limiting element, and the pulling member further includes a connecting tube, the pull rod is inserted into a front end of the connecting tube. the jaw base comprising a hollow tube, a first arm, and a second arm, which are integrally formed, the first arm and the second arm standing oppositely at a front end of the hollow tube, and an elongated slot between the first arm and the second arm for accommodating the first jaw and the second jaw, the pulling member extending along a cavity of the hollow tube; the first jaw and the second jaw being openable and closeable, and are movably arranged in the elongated slot of the jaw base; a rear end of the first jaw and a rear end of the second jaw being relatively rotatably connected with a front end of the pulling member, and the pulling member extends rearward within the cavity of the hollow tube, wherein the jaw assembly of biopsy forceps further includes a sampling needle, the limiting element is arranged between the first jaw and the second jaw, two ends of the limiting element are respectively fixed to the first arm and the second arm, and the limiting element is configured to limit a maximum stroke of the pulling member pushing forward; the first jaw and the second jaw are individually provided with a ramp for being matched with the limiting element to open or close the first jaw and the second jaw, the rear end of the first jaw, the rear end of the second jaw, and a front end of the pulling member are riveted by the shaft member; and the pulling member includes a pull rod, an annular connecting portion is arranged at a front end of the pull rod, and the shaft member penetrates through the annular connecting portion to realize riveting of the pulling member with the first jaw and the second jaw,