Can Apple Watch 7 charger be used for iphob 12 charging

Absolutely not.

Completely different and not compatible.

prasad140 Said:

"Can Apple Watch 7 charger be used for iphob 12 charging"

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Use a MagSafe Charger for this:

1. Go Here: How to Use MagSafe Duo Charger with your iPhone and Apple Watch - Apple Support
2. As it Reads: "To use both the iPhone and Watch charger at the same time, the MagSafe Duo Charger requires at least 15W (5V/3A or 9V/1.67A), but this will result in slower charging."