Engine oil pump

The invention discloses an engine oil pump. A cover plate is arranged on a pump shell of the oil pump, a power shaft is arranged at the centre of the cover plate, an inner rotor and an outer rotor which are driven by the power shaft are arranged in the pump shell, and a tensioner installation structure and an oil gauge installation hole are arranged outside the pump shell. The engine oil pump disclosed by the invention enables arrangement of a whole engine to be more reasonable and reliable, and an installation-fixation point for an oil gauge is reserved on the oil pump and a tensioner installation position is arranged on a cover for installation of an oil gauge tube and fixation of a tensioner. In addition, an oil-gas separation structure is integrated on the pump cover and capable of effectively carrying out oil-gas separation on a mixer of a crankcase ventilator, effectively serves a crankcase ventilation system, and enables the arrangement of the engine to be more compact. 本发明揭示了种发动机机油泵，机油泵的泵壳体上设有盖板，所述盖板中