Wondering if it's ok to put aloe on a very painful and burning hemorriod?

Yes, but better Rx. Aloe may provide some relief but if symptomatic, there are better preparations that often include a corticosteroid such as Hydrocortisone (anusert, anusol, proctosol). In addition, getting to the root of what causes hemorrhoids (constipation, not sufficient fiber, not enough water intake, not enough exercise) should be taken into account to reduce the severity of hemorrhoids.