The invention relates to the technical field of ceramsite for landscaping, in particular to ardealite ceramsite for landscaping and a preparation method of the ardealite ceramsite. Ardealite is used as a main raw material; by use of the water absorption property of the ardealite and the water permeability and the gas retention property of ceramsite pores, a large amount of water vapor generated bythe earth surface can be in the ceramsite pores; furthermore, by combination with ardealite treatment by kieselguhr, adding of shale powder and coal powder treatment by medical stones and zeolite, the ardealite ceramsite can be maintained after being subjected to mixing granulation; the ardealite ceramsite is relatively high in bonding strength; the cylinder compressive strength of the ceramsiteis substantially improved; therefore, the water and moisture retention performance is improved, and the air permeability of a landscaping forest is improved, ponding in rainy days is avoided, and thequality of a landscaping environment is improved.