The invention discloses a chemical adsorption type heat refrigeration system employing an alkaline-earth metal halide. The chemical adsorption type heat refrigeration system comprises N adsorption bed components, wherein each adsorption bed component comprises an adsorption bed unit tube component, an ammonia gas adsorption pipeline and an ammonia gas desorption pipeline, a heat source inlet pipeline, a cooling water inlet pipeline and a cooling water return pipeline; each adsorption bed unit tube component comprises M adsorption unit tubes, each adsorption unit tube comprises an adsorption outer tube, a plurality of trays arranged in the adsorption outer tube and a filter screen arranged between two adjacent rows of trays, an adsorbent is arranged in each tray, and the top ends of the adsorption outer tubes are connected to a gas manifold; a condenser, a liquid ammonia tank, a throttle valve and an evaporator are connected between each ammonia gas adsorption pipeline and each ammonia gas desorption pipeline in sequence. According to the chemical adsorption type heat refrigeration system, through cooperative application of chemical adsorption beds for adsorption and desorption, the uninterrupted heating or cooling is realized, and the refrigerating capacity and the refrigeration depth are improved under the same heat source condition.