I agree with Michael. I would not use KMnO4 in acidic media cause it could also be consumed in other reactions (oxidation of easily oxidizable organics and inorganics present). Depending on the concentracion of H2O2 in solution it could be determined by iodometric titration ([H2O2] > 10-3M). For lower H2O2 conc. or diluted samples the titanium oxalate method  and the vanadate method  (Nogueira et. al., 2005, Talanta 66(1) 86-91) are valid although in both cases colour intereferences should be checked.      

using a metal hexacyanoferrate modified electrode, although dont discard the permanganometry method, maybe with a automatic titration system

Thank you!

Will the simple titration with KMNO4 under acidic condition work?

thru titanium oxalate method. potassium titanium oxalate reacts w/ h2o2 in acidic soln to form yellow complex. you can then measure h2o2 conc. spectrophotometrically at 400nm

I agree with Michael. I would not use KMnO4 in acidic media cause it could also be consumed in other reactions (oxidation of easily oxidizable organics and inorganics present). Depending on the concentracion of H2O2 in solution it could be determined by iodometric titration ([H2O2] > 10-3M). For lower H2O2 conc. or diluted samples the titanium oxalate method  and the vanadate method  (Nogueira et. al., 2005, Talanta 66(1) 86-91) are valid although in both cases colour intereferences should be checked.      

I agree with Dr. Eva Rodríguez. I also feel that iodometric method is the best method for milli molar above hydrogen peroxide concentrations. In my opinion, it is simple and accurate and can be done with laboratory desktop chemicals.