The invention discloses a fully electronically controlled in-line distributor type fuel injection pump assembly which comprises a pump body and a pump head arranged on the pump body, wherein a cam shaft is arranged in the pump body; a plunger is arranged in the pump head; a high-pressure oil chamber is arranged at the head part of the plunger; the cam shaft comprises a main shaft and a cam arranged on the main shaft; four bulges adopting the same structure are uniformly distributed on the cam; an included angle between the axes of every two bulges is 90 degrees; each bulge comprises a concave arc section, a working section, a transition section and a deceleration section; each adjacent bulge on the cam corresponds to one working cycle of the plunger; the plunger reciprocates up and sown four times as the cam shaft rotates once; and a high-pressure fuel distribution mechanism is arranged on the pump head. The fully electronically controlled in-line distributor type fuel injection pump assembly realizes timed and quantitative control of fuel injection quantity, solves the problem of poor consistency of fuel quantity of a conventional electronically controlled unit pump; and meanwhile the fully electronically controlled in-line distributor type fuel injection pump assembly solves the problem of low pressure at an end of a fully electronically controlled VE pump, and improves the combustion performance of an engine.