The present invention provides a wimble cover shaped combustor of fuel heater comprising a combustion chamber cover, a oil suction wimble liner, a primary combustion barrel, a secondary combustion barrel, an air inlet guide barrel, an air inlet split stream slice, a fuel oil tube and a glow plug; the oil suction wimble liner is applied on the combustion chamber cover internal surface, an oil groove is arranged between the both; the primary combustion barrel is connected to the combustion chamber cover, and the air inlet guide barrel is arranged at outer portion of the primary combustion barrel, and air inlet holes are arranged circumferentially on the barrel wall of the primary combustion barrel; the primary combustion barrel is connected to the back end of the air inlet guide barrel to form a conical contraction hole; the front end of the air inlet guide barrel connects to the air inlet split stream slice which is provided with air split stream holes; the secondary combustion barrel connect is connected to the back end of the air inlet guide barrel; the combustion chamber cover has a conical shape, a fuel oil tube connected onto, a glow plug arranged on top, and tangential air holes are arranged circumferentially on the combustion chamber cover. The invention provides credible, rapid ignition start, uneasily generates carbon deposition, has high combustion efficiency and economical efficiency improved by more than 6%.