Steam generator

The invention discloses a steam generator, which comprises an outer tank of which the top is provided with steam outlets, wherein a combustor, a fan which is connected with the combustor and is used for discharging smoke, a circulation pump which is connected with the combustor and is used for supplying water, a steam and water separator which is connected with the combustor and is used for generating steam, and a controller electrically connected with the combustor, the fan and the circulation pump are arranged in the outer tank; the top of the outer tank is provided with a heat recovery structure used for recycling steam conduction residual heat through raw material water; and a residual heat recovery device capable of carrying out secondary temperature rise and heating on the raw material water through the smoke of the combustor is arranged in the outer tank, heat energy generated by the combustor can be fully utilized, and in addition, a smoke discharging amount is small. The steamgenerator generates stea