Upper furnace door of clean heat recovery coke oven

The invention provides an upper furnace door of a clean heat recovery coke oven. The upper furnace door comprises a furnace door body (1) and three detachable zigzag-form cast iron lower edges (2), wherein an arc segment is arranged on the body (1) and is provided with a semicircular groove (3), an asbestine circular rope is arranged in the semicircular groove (3), and the detachable zigzag-form cast iron lower edges (2) are connected with the furnace door body (1) through heatproof bolts. According to the invention, through improvement of the structure of the furnace door and the material of a fireproof casting layer, the sealing mode of the furnace door is changed into flexible sealing, so the problems of poor sealing, severe leakage, unorganized air supply for the coke oven and great amount of heat dissipation of current rigid surface contact are overcome, the rate of non-fully coked char is reduced, waste heat utilization and total char yield are improved, and less resources are wasted; meanwhile, frequency of replacing of the whole upper furnace door due to burnt lower edges of the upper furnace door is reduced, and it only needs to replace a burnt lower edge with the detachable zigzag-form cast iron lower edge, so economic benefits and social benefits of an enterprise can be improved.