Engine oil pump, engine front cover and engine

The utility model discloses an engine oil pump. The engine oil pump comprises a shell, a rotor mechanism (2), and a rotor mounting part (11) which is arranged on the shell and is used for mounting the rotor mechanism (2), wherein an oil inlet (161) through which engine oil flows into the rotor mechanism and an oil outlet (162) through which the engine oil flows out of the rotor mechanism are formed on the shell; a low-pressure oil chamber (12) and a high-pressure oil chamber (13) are formed in the shell; the low-pressure oil chamber (12) is communicated with the oil inlet (161); the high-pressure oil chamber (13) is communicated with the oil outlet (162); a pressure relief oil cushion chamber (14) is formed between the low-pressure oil chamber (12) and the high-pressure oil chamber (13); and a barrier wall (41) is also arranged between the low-pressure oil chamber (12) and the pressure relief oil cushion chamber (14). The engine oil pump can improve oil pumping efficiency. The utility model also provides an engine front cover which is integrally provided with the engine oil pump, and an engine which applies the engine front cover.