Concentrating type solar heat collector and solar water heating system

The utility model provides a concentrating solar thermal collector and a solar water heating system. Comprising a shell and a heat collecting pipe, the heat collecting pipe is installed in the shell, and the shell comprises a reflection wall face; the heat collecting pipe is a coaxial multi-layer pipe, a cavity is formed between every two adjacent layers of pipe walls, the inner cavity of the heat collecting pipe is divided into a first water passing area and an adsorbent filling area from outside to inside by the multi-layer pipe walls, and the number of the pipe walls is 2-4; a supporting column is installed in a cavity of the first water passing area, an absorbing coating is arranged on the outer surface of the supporting column, and filter screens are installed at the inlet end and the outlet end of the heat collecting pipe. Solar rays are reflected to the absorbing coating through the reflecting wall face, passing water flow absorbs solar energy and is heated, and redundant heat is transmitted to the ads