The utility model discloses a gas-solid phase catalytic reactor which comprises a reactor housing, a catalyst bed and a heat exchange device, wherein a gas inlet pipeline is formed on the sidewall of the reactor housing to extend in the tangent direction of the sidewall; the catalyst bed is arranged in the reactor housing, forms an annular rotational flow chamber with the reactor housing, and is a hollow cylinder; a through hole communicated with the interior of the catalyst bed is formed in the housing of the catalyst bed; and the heat exchange device is arranged in the catalyst bed. The gas-solid phase catalytic reactor provided by the utility model is capable of obtaining longer stay timer in the manner of tangent entrance of the reactant gas and rotational flow in the rotational flow chamber in contrast with the manner of direct radial entrance of the gas; therefore, the reactant gas has longer time to be evenly dispersed in the rotational flow chamber through the rotational flow and then enters the catalyst bed to react in the presence of the catalyst; and the reactant gas is distributed more evenly in the axial space of the whole catalyst bed of the reactor.