The utility model relates to an electric power tech field especially relates to a boiler afterbody flue return bend and boiler flue system in firepower power plant. Boiler afterbody flue return bend in this firepower power plant includes return bend body, a plurality of water conservancy diversion piece and abrasionproof sleeve pipe, and the import department of return bend body is the formula of drawing together gradually, and the exit is the convergent formula, and the volume of return bend body department is great for the volume of other positions of flue, and when the flue gas that mix with solid particle got into return bend department, flue gas velocity can reduce, and wherein solid particle can reduce the impact of return bend inside, and a plurality of water conservancy diversion pieces are arranged the setting and are in the return bend is originally internal to can shunt and keep apart the flue gas that gets into, simultaneously, solid particle wherein also carries out the water conservancy diversion through the water conservancy diversion piece, has avoided the damage of solid particle to the return bend inner wall.