To provide a method for producing a reformed crude oil for efficiently improving quality of a low-quality crude oil.

The method for producing a reformed crude oil comprises: a step of separating a naphtha fraction from a crude oil to produce a topped crude oil (a naphtha fraction separation step); a step of hydrogenating the topped crude oil (a topped crude oil hydrogenation step); and a step of utilizing the naphtha fraction for the production of the reformed crude oil (a naphtha fraction utilization step).