The present disclosure provides a solar heat absorber including: an inlet through which a heat collecting medium enters the solar heat absorber; a passage member configured to be fluidly connected with the inlet such that the heat collecting medium enters the passage member through the inlet; and a collection member configured to be fluidly connected with the passage member such that the heat collecting medium enters the collection member through the passage member. In the solar heat absorber according to the present disclosure, the ceramic particles are used as the heat collecting medium. In addition, the present disclosure also provides a solar heat collecting system including the solar heat absorber, and a solar power generation system including the solar heat collecting system.