The invention relates to a spiral plug-flow channel plate type heat exchanger. The spiral plug-flow channel plate type heat exchanger is composed of a heat exchanging core, an inlet flow guiding section, an outlet flow guiding section, a hot fluid inlet and outlet and a cold fluid inlet and outlet. The heat exchanging core of the heat exchanger adopts a flowing channel where heat exchanging is conducted through spiral parallel countercurrent flow, and thus more sufficient heat exchanging of fluid in the heat exchanger is facilitated. The inlet flow guiding section and the outlet flow guiding section adopt direct in-out and side in-out staggered structures, and thus more even distribution of the fluid in the heat exchanger is facilitated. The cold fluid inlet and outlet and the hot fluid inlet and outlet adopt a square-round transition structure, and thus a more compact structure of the heat exchanger is facilitated. The spiral plug-flow channel plate type heat exchanger can achieve solid two-dimensional heat conduction, the heat conduction resistance is reduced, the heat transmission capacity between the fluid on the two sides is increased, the heat transmission area of the heat exchanger is enlarged, the compactness of the heat exchanger is improved, the comprehensive efficiency of the heat exchanger is improved, deformation caused by concentrated distribution of thermal stress is improved, the safety property of the heat exchanger is improved, and the service life is prolonged.