The invention relates to a modularized fuel oil conveying device for a railway vehicle. The modularized fuel oil conveying device comprises a support. A first electric oil pump, a second electric oil pump, a first fuel coarse filter, a second fuel coarse filter, a manual rocking pump and a magnetic filter are fixed to the support. An upper oil tank oil supply joint and an upper oil tank oil inflow joint are arranged at the upper portion of the support. A unit oil supply joint, a lower oil tank oil inflow joint and a lower oil tank oil supply joint are arranged at the lower portion of the support. The oil conveying ends of the two electric oil pumps and the manual rocking pump pass valves and then are connected with the upper oil tank oil inflow joint. The oil inflow ends of the manual rocking pump and the first electric oil pump pass the first fuel coarse filter and then are connected with the lower oil tank oil supply joint. The oil inflow end of the second electric oil pump passes the second fuel coarse filter and is then connected with the lower oil tank oil supply joint. An oil outlet of the magnetic filter is connected with the unit oil supply joint. An oil inlet of the magnetic filter is connected with the upper oil tank oil inflow joint and the lower oil tank oil inflow joint through an oil supply valve and an oil draining valve respectively.