每次从外地回到我的家乡，看到它的青山绿水
What does 青山绿水 mean?

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well the original 青comes from a dye called 靛青(indigo-blue)，later 青 can be used for describing those colors：
1. blue：青天means blue sky;
2. indigo blue：靛青
3. deep green：青草；青山；
4.black：青衫（black clothes）

I think 绿水 is easy to understand，：D 
river around the mountain if not polluted always shows green color，：D

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green hills and blue waters

here it means beautiful sceneries

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Here,“青山绿水”means all the beatyful  scenery风景

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Blue mountains, green waters, usually expressed beautiful scenery.

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在這句句子中，青山綠水沒有太大的特殊意思！只是用來表達沿途的風景很漂亮的一種描述的手法而已！