Tail gas environment-friendly treatment device of combustion boiler

The invention discloses a tail gas environment-friendly treatment device of a combustion boiler. The tail gas environment-friendly treatment device comprises a casing, wherein a gas inlet pipe is inserted and connected with the bottom of the outer wall of one side of the casing; a heat collecting pipe is inserted and connected with one end of the inner wall of the bottom of the gas inlet pipe; each of the inner wall of the top and the inner wall of the bottom of the gas inlet pipe is connected with fixing blocks in equal-distance distribution through fastening screw bolts; slide grooves are formed in the inner walls of the two ends of the gas inlet pipe; a pulley is glidingly connected inside each of the two side grooves; one end, far away from the slide groove, of each of the two pulleysis connected with a moving block through fastening screw bolts; one side of each of the two moving blocks is connected with a telescopic rod through a fastening screw bolt; a clamp groove is formed inthe middle position of on