The invention provides an anorectal operation auxiliary device which comprises a tubular hollow body, a conical guide part placed at the far end of the hollow body, and an external expansion fixing part placed at the close end of the hollow body. At least one opening is formed in the side wall of the hollow body, and at least one suture pulling device is arranged on the inner surface of the side wall of the hollow body. Compared with traditional hemorrhoidectiomy and anastomat haemorrhoids mucosa incisione anulare anastomosis, the anorectal operation auxiliary device can be used for well conducting even purse string suture on non-annular haemorrhoids. Meanwhile, the anorectal operation auxiliary device can be effectively matched with a microscopic anastomat to quickly and effectively excise the non-annular haemorrhoids, the operation time is greatly shortened, and meanwhile the pains of a patient is greatly lightened.