To provide a solar heat collecting device, and a greening and pasturing method using the solar heat collecting device capable of carrying out greening of a desert region, and pasturing livestock in the desert region.

The solar heat collecting device is provided with a plurality of reflection parts 3 reflecting sunlight, a heat collecting part 5 receiving heat of the sunlight reflected by the reflection parts to heat water, an evaporation part evaporating the heated water, a condensation part condensing the evaporated steam to produce fresh water, and a driving part driving the reflection parts 3 on the basis of movement of the sun to reflect the sunlight toward the heat collecting part 5. It is characterized by that the plurality of reflection parts 3 are arranged with predetermined intervals L in between, and shaded areas 31 formed by the plurality of reflection parts 3, and irradiated areas 33 irradiated by sunlight passing the predetermined intervals L are formed on the ground G.