There may come a time when you may need to remove all the products in your WooCommerce powered ecommerce website. There’s just no easy way to do this natively in WooCommerce. I needed to do it because I changed the my product data XML file I was using to import into the site. It’s pretty straight forward, but to do it properly, you have to make sure you’re deleting all the additional data such as taxonomy, relationships, etc connected with all the existing products.
I tried using the WooCommerce Remove All Products plugin to do this, but first it didn’t work with my WordPress 4.1.1 installation and second it doesn’t remove any taxonomy.
So, to remove all your products you’ll need access to your PhpMyAdmin or some other tool like Sequel Pro to edit your WordPress database. I’ll be using PhpMyAdmin because its the easiest.
https://www.kingrosales.com/blog/how-to-properly-delete-all-woocommerce-products/
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