Your fightstick will work on the PS5 if it is a PS4 fightstick that is officially licensed by Sony or if you can upgrade its PCB. Of course, your fightstick will also work on the PS5 if it is advertised as compatible with the PS5. You can check out our list of the top PS5 fightsticks.
If you still want to use your fightstick, check its box or look it up online to know if it was officially licensed by Sony. Otherwise, if you are using a fightstick that you made from a DIY kit or if you bought a fightstick from an individual’s website rather than a company, odds are that it comes with the Brook Universal Fightboard (UFB), which is the best multiplatform printed circuit board (PCB). If you have that PCB, you can attach the Brook UFB-UP5 for PS5 compatibility. Otherwise, the Mayflash Magic-S Ultimate may be the solution you are looking for: