The present invention relates to adsorbent for ammonia refrigeration, is especially one kind of attapulgite clay base composite adsorbent for ammonia refrigeration and its preparation and application, and belongs to the field of new chemical functional material preparing technology. The composite adsorbent for ammonia refrigeration is prepared through mixing alkali earth chloride, attapulgite clay, pore expanding agent and adhesive in certain proportion, forming in a pelletizing machine, stoving and roasting. The composite adsorbent has the advantages of stable performance, high adsorption stability, etc.