Disclosed is a method of manufacturing a compound semiconductor solar cell according to an embodiment of the invention. The method of manufacturing the compound semiconductor solar cell according to the embodiment of the invention includes forming a plurality of compound semiconductor layers of at least two elements and including a base layer and an emitter layer, the base layer including a first conductivity type dopant to have a first conductivity type and the emitter layer including a second conductivity type dopant to have a second conductivity type. The forming of the plurality of compound semiconductor layers includes at least one of a process-temperature change period and a growth-rate change period.