A variable flow engine oil pump has a first seat, a second seat attached to the first seat, and a regulating valve assembly and a pressurizing assembly mounted in the second seat. An eccentric wheel of the pressurizing assembly meshes with a plug of the regulating valve assembly. With the plug driving the eccentric wheel to rotate by an angle, a volume flow rate of engine oil output by the engine oil pump can be adjusted. Elements used for adjusting the output of the engine oil are reduced, and manufacturing cost and assembling complexity of the engine oil pump are lowered accordingly. Moreover, since the regulating valve assembly drives the pressurizing assembly directly, the regulating valve assembly can drive the pressurizing assembly efficiently.