The utility model discloses a cigarette dust pelletizing system is fallen in tunnel, explode construction trolley frame, spray pipe, high penstock and valve including boring, the brill explodes the construction trolley frame and is the portal frame, the spray pipe is located to bore and is exploded on the construction trolley frame, the spray pipe is arranged along boring the gate -type frame that explodes the construction trolley frame, the spray pipe transversely is equipped with two rows, the equipartition has the hole for water spraying on the spray pipe, the spray pipe is connected with high penstock, high penstock is connected with the valve, the hole for water spraying all be equipped with two rows on every spray pipe, the valve be the gate valve, the utility model discloses a spray pipe spun high pressure water curtain, the bonding dust to with the bankrupt poisonous gas reaction who gives birth to of tunnel implosion, thereby play the effect of falling the cigarette and removing dust, optimized the air circumstance in the tunnel, ensured good construction operation environment.