The invention relates to a dedusting and punching device which comprises a churn drill or an electric hammer and a dust collector. The dedusting and punching device is characterized in that a pipe hole at one end of the dust collector is hermetically connected with a right-angled connecting pipe; a pipe hole at the other end of the right-angled connecting pipe is hermetically connected with a lower right-angled dust pipe; the upper pipe section of the lower right-angled dust pipe is provided with a transverse through hole; a drill bit of the churn drill or the electric hammer passes through the transverse through hole; s dust ring is arranged around the opening of the transverse through hole on one side of the head of the drill bit; the upper end opening of the lower right-angled dust pipe is provided with an upper cover; the churn drill or the electric hammer is provided with a fixed ring; the outer side of the right-angled connecting pipe is provided with a flexible support pipe which is connected with the fixed ring of the churn drill or the electric hammer. The dedusting and punching device has the advantages that the structure is simple; dust and sand generated in a punching process can be effectively removed during punching; dust is prevented from flying, and an effective protection effect on the environment and operating personnel is achieved.