Police say that 10-year-old, Kyle Spencer, was crossing Garrett Road when he was hit.
Police say the truck kept on going, leaving Kyle in the street.
Medics were called and Kyle was taken to Children's Hospital where he is in stable condition.
Upper Darby police are looking for a white box truck with two men inside.
You can get the latest crime statistics from the Philadelphia Police by CLICKING HERE for the force's crime data mapping site.