The invention belongs to the technical field of heat energy, and particularly relates to a heat source tower chemical heat pump. The heat source tower chemical heat pump comprises a generator and a heat source tower, wherein the generator comprises a container, an evaporating pipe is arranged in the container, one end of the evaporating pipe extends out of the container to be connected with the outlet end of a compressor, the other end of the evaporating pipe extends out of the container to be connected with the heat exchange inlet end of a preheat heat exchanger, and the inlet end of the compressor is communicated with the interior of the container. A runner pipe which is used for communicating the container and the heat source tower is arranged between the container and the heat source tower. A liquid outlet end of the heat source tower is connected with a heat taking and liquid inlet end of the heat exchanger through a pipeline. A heat taking and liquid outlet end of the heat exchanger is communicated with the container through a pipeline. Liquid media flowing out of the heat taking and liquid outlet end of the heat exchanger are sprayed on the evaporating pipe in the container. The heat source tower chemical heat pump is simple in structure and only needs the heat source tower, the heat exchanger, the compressor and the pipelines, so that invested cost of equipment is relatively reduced. Due to the fact that devices which need to use electricity are few, operation cost of the equipment is reduced, and resources are saved. Meanwhile, the heat source tower chemical heat pump is high in heat exchange efficiency and good in heat exchange effect.