can i watch apple tv on my tablet?

Yes you can watch Apple TV+ content on your tablet. I presume from your hardware profile that you are asking about non-Apple devices.

Apple provides a webpage called All the ways to watch Apple TV+ and more. At the foot of this page is a linked document Watch in a web browser in which is the advice "On a Windows PC (including Microsoft Surface), Chrome OS device, or Android device, you can watch Apple TV+ in the Chrome and Firefox web browsers."