The invention relates to the technical field of automobile part structures, in particular to an oil drainage bolt assembly and an engine oil bottom shell with the same. An engine oil collecting channel is formed in the oil bottom shell and comprises a transverse channel located in the bottom in the oil bottom shell and a vertical channel located in the inner side wall of the oil bottom shell; oneend of the transverse channel extends to the low-lying position in the oil bottom shell, and the other end of the transverse channel penetrates through the side wall of the oil bottom shell; the lowerend of the vertical channel communicates with the transverse channel, and the upper end of the vertical channel penetrates through the side wall of the oil bottom shell; the engine oil collecting channel further comprises an oil drainage bolt which is detachably connected to the end, on the side wall of the oil bottom shell, of the transverse channel; and the end, extending to the transverse end,of the oil drainage bolt is provided with a filter net assembly. The oil bottom shell is simple in structure and convenient to mount and dismount, the risk that air is sucked into an engine when thestoring amount of engine oil is insufficient or the limit large dip angle exists can be effectively lowered, additionally, the detachable filter net assembly can also be convenient to dismount and wash, the service life of the engine oil is prolonged, and great promotional value is achieved.