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I am with Raster Calculator in ModelBuilder on ArcGIS Desktop 10.2.

In the Raster Calculator's Map Algebra expression window, I need to check if a Raster dataset has already existed or not.

Can IsNull do this job?

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No, IsNull will not check if your raster exists, it tests for NoData (null values) in an existing raster.

No, you can't check if a raster exists in the Raster Calculator.

You need a precondition in your model before the Raster Calculator.

See:

Using If-Then-Else logic for branching (arcgis.com)

and

If Then Else in ArcGIS model builder (gis.stackexchange.com)

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