The invention provides a coking furnace flue waste gas heat recovery device capable of preventing coking. The device comprises a waste heat recovery temperature control section (1), a reduced pressure coke removal section (2) and an efficient waste heat recovery section (3) which are sequentially connected, wherein the waste heat recovery temperature control section (1) is vertically arranged and has an unchangeable inner diameter, second medium pipelines (5) are arranged on the side wall, and a first temperature sensor is arranged at an outlet of the waste heat recovery temperature control section (1); the reduced pressure coke removal section (2) is arranged horizontally and has the inner diameter increasing gradually from left to right, the bottom of the reduced pressure coke removal section (2) is V-shaped, first medium pipelines (4) are arranged at the bottom, a coke collection tank (8) is formed in the lowest position, and a macropore metal net is arranged at the top of the coke collection tank (8); the efficient waste heat recovery section (3) is vertically arranged and has an unchangeable inner diameter, and third medium pipelines (6) are arranged on the side wall of the efficient waste heat recovery section (3); the waste heat recovery temperature control section (1) and the efficient waste heat recovery section (3) have the same inner diameter; an inclined temperature control section (7) is arranged between the reduced pressure coke removal section (2) and the efficient waste heat recovery section (3); a second temperature sensor and a heating device (9) are arranged in the temperature control section (7). The provided waste heat recovery device is simple in structure, good in caking prevention effect and high in waste heat recovery efficiency.