Engine oil filling device for drive gear box assembly

The invention discloses an engine oil filling device for drive gear box assembly. The engine oil filling device comprises a drive gear box body, an oil adding opening, an oil outlet and an engine oilfilling box. The oil adding opening is formed in the right upper end of the drive gear box body in a communicating manner, and an oil adding sealing cover is sealed on the oil adding opening in a threaded fit manner. The oil outlet is formed in the left lower end of the drive gear box body in a communicating manner, and an oil outlet sealing cover is sealed on the oil outlet in a threaded fit manner. In the engine oil filling device, engine oil can be poured into an engine oil filling box in advance, a sealing pull plate is firstly sealed, the engine oil amount in the engine oil filling box isobserved through scale lines on a synchronous liquid level pipe, and the aim of quantitatively pouring the engine oil is achieved; and the engine oil is poured into the engine oil filling box in advance, the phenomenon that o