The utility model discloses a modular automatically controlled rail high -pressure oil pump altogether, for orthostichous multicylinder high -pressure oil pump, including the pump body, pump cover, plunger matching parts, plunger spring, guide piston subassembly, drive assembly and proportional valve, plunger matching parts and guide piston subassembly are all installed in pump body upper portiondowntheholely, and plunger matching parts includes plunger and plunger bushing, plunger bushing upper portion offer with the plunger bushing in play oil pocket and a plurality of oil feed chamber of high -pressure oil chamber intercommunication, install the delivery valve at the intracavity that produces oil, all install the filling valve at a plurality of oil feed intracavitys, go out oil pockethigh -pressure oil chamber on delivery valve and pump cover and high pressure fuel oil -out intercommunication in proper order, pump body upper portion is provided with low pressure fuel oil return opening and low pressure fuel oil inlet, and low pressure fuel oil inlet is the low pressure fuel oil channel on proportional valve, pump cover and filling valve and oil feed chamber intercommunicationin proper order, drive assembly installs in the protruding axle hole of pump body lower part. The utility model has the advantages of pressure is high, high, the compact structure of reliability.