How to get site homepage from plugin?

You are just not using the right function. Try using this:

<iframe id="preview_frame" src="https://wordpress.stackexchange.com/questions/130860/<?php echo home_url(); ?>"></iframe>

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)