Can I trade in damaged screen on Apple Watch

Unfortunately no. Nor can you get it fixed if it’s a newer model. I’ve had my series 9 for less than six months and dropped it as I was putting it on yesterday. The screen broke and I figured I could get it fixed like all Apple products. Found out just 30 min ago you can’t and the only option is to pay 300 to fix it or 400 to buy a new one! I’ve only had apple products and never had an issue fixing screens. Had I known it couldn’t be fixed, I for sure would have bought the care + if I had been warned. Buyer beware you better otterbox your watch too and buy extra protection! 😡 as for me this has soured in on apple and seriously thinking of crossing over to other products.

No. Damaged devices have zero value for trade in. If you go through the process, they'll just recycle it for you.