Manny Pacquiao -- DROPS MUSIC VIDEO ... For Fight Walkout Song

Move over Michael Bolton ... there's a new king of the super emotional music video -- and it's Manny Pacquiao.

The boxer just dropped his music video for his new song "Lalaban Ako Para Sa Filipino" ... which he recorded specifically for his walkout music for the Floyd Mayweather fight.

It roughly translates to "I Fight for the Filipino People" -- and the video is essentially a touching tribute to the people of his home country.

The video has everything from dramatic montages of children ... street fires ... stray pigs ... and of course, all the Manny training footage you could want!

BTW -- Manny directed the whole thing.