Convex-concave assembling structure of jaw body and jaw insert

The invention discloses a convex-concave assembling structure of a jaw body and a jaw insert. The structure comprises the jaw body, the jaw insert and a micro-adjustment bolt; the convex portion and the concave portion of the jaw body correspond to the concave portion and the convex portion of the jaw insert correspondingly, and the micro-adjustment bolt is rotated in a micro-adjustment threaded hole in the jaw body to fasten the jaw insert with micro force. The convex-concave assembling structure is simple in structure, the round bar is simple in clamping process, the jaw insert fixed mounting process is simple, the efficiency is high, reliability is high, the service life of the jaw body and the jaw insert is long, the cost is low, and the problem that a jaw body and a jaw insert of an existing horizontal electric heating upsetting machine are not likely to be fixedly assembled, and the service life of the jaw body and the jaw insert is low is effectively solved.