The invention belongs to the technical field of boiler equipment, and particularly discloses a coal economizer bypass flue structure which can ensure that the denitration smoke temperature of an inlet of an SCR denitration device can reach the denitration requirement and the smoke temperature of an outlet of the SCR denitration device can allow a catalyst to operate normally. The coal economizer bypass flue structure comprises a tail flue, wherein a high-temperature coal economizer is mounted in the tail flue, and the tail end of the tail flue is connected with an uptake flue of the SCR denitration device. The coal economizer bypass flue structure is characterized in that the coal economizer bypass flue structure further comprises a bypass flue; one end of the bypass flue is communicated with the tail flue at the upper end of the high-temperature coal economizer; the other end of the bypass flue is communicated with an inlet position of the uptake flue of the SCR denitration device; and a regulating baffle plate is mounted in the bypass flue.