A fuel processing apparatus, comprising: an apparatus body; a fuel reforming part disposed at the central portion of the apparatus body; a heating part disposed at the upper portion of the apparatus body so as to heat the fuel reforming part; a CO shift-converting reaction part connected with the fuel reforming part, and disposed at the lower portion of the apparatus body; and a PROX reaction part connected with the CO shift-converting reaction part, and disposed at the upper portion of the apparatus body; wherein the fuel reforming part comprises: a fuel gas inlet disposed to be connected with the lower end of the apparatus body; a first passage connected with the fuel gas inlet, and disposed inside the apparatus body so that the inflow fuel gas is moved upwards; a reforming catalyst layer connected with the first passage, and disposed at the inner central portion of the apparatus body; and a second passage connected with the reforming catalyst layer, disposed at the inside of the first passage, and provided so that the fuel gas having passed through the reforming catalyst reaction is moved downwards, wherein the heating part comprises: a center burner disposed at the upper central portion of the apparatus body; a heat dispersing plate disposed at the upper end of the reforming catalyst layer at the lower portion of the burner; an exhaust gas passage disposed along the outer circumference of the fuel reforming part inside the apparatus body; and a side burner disposed along the circumference of the center burner. an apparatus body; a fuel reforming part disposed at the central portion of the apparatus body; a heating part disposed at the upper portion of the apparatus body so as to heat the fuel reforming part; a CO shift-converting reaction part connected with the fuel reforming part, and disposed at the lower portion of the apparatus body; and a PROX reaction part connected with the CO shift-converting reaction part, and disposed at the upper portion of the apparatus body; wherein the fuel reforming part comprises: a fuel gas inlet disposed to be connected with the lower end of the apparatus body; a first passage connected with the fuel gas inlet, and disposed inside the apparatus body so that the inflow fuel gas is moved upwards; a reforming catalyst layer connected with the first passage, and disposed at the inner central portion of the apparatus body; and a second passage connected with the reforming catalyst layer, disposed at the inside of the first passage, and provided so that the fuel gas having passed through the reforming catalyst reaction is moved downwards, wherein the heating part comprises: a center burner disposed at the upper central portion of the apparatus body; a heat dispersing plate disposed at the upper end of the reforming catalyst layer at the lower portion of the burner; an exhaust gas passage disposed along the outer circumference of the fuel reforming part inside the apparatus body; and a side burner disposed along the circumference of the center burner. a fuel gas inlet disposed to be connected with the lower end of the apparatus body; a first passage connected with the fuel gas inlet, and disposed inside the apparatus body so that the inflow fuel gas is moved upwards; a reforming catalyst layer connected with the first passage, and disposed at the inner central portion of the apparatus body; and a second passage connected with the reforming catalyst layer, disposed at the inside of the first passage, and provided so that the fuel gas having passed through the reforming catalyst reaction is moved downwards, wherein the heating part comprises: a center burner disposed at the upper central portion of the apparatus body; a heat dispersing plate disposed at the upper end of the reforming catalyst layer at the lower portion of the burner; an exhaust gas passage disposed along the outer circumference of the fuel reforming part inside the apparatus body; and a side burner disposed along the circumference of the center burner. a center burner disposed at the upper central portion of the apparatus body; a heat dispersing plate disposed at the upper end of the reforming catalyst layer at the lower portion of the burner; an exhaust gas passage disposed along the outer circumference of the fuel reforming part inside the apparatus body; and a side burner disposed along the circumference of the center burner.