A surgery automatic suturing and knot tying apparatus is to suture and tie knots on a surgical suture having a needle end and a tail end. The surgery automatic suturing and knot tying apparatus comprises a positioning board, a threading module located on the positioning board, and two thread drawing modules and two needle threading arms located on the positioning board. The two needle threading arms wind the surgical suture around the threading module, and collaborate with the two thread drawing modules to draw the surgical suture to make the surgical suture finally be separated from the threading module, thereby can tie knots automatically on the surgical suture to meet use requirements and alleviate the burden of doctors during surgical operation.