The utility model discloses an anti-reverse-spraying oil filling pipe. The device comprises an oil tank, an oil level and a device body, an oil filling port cover is arranged at the upper end of the device body; the bottom end of the oil filler cap is fixedly connected with an exhaust outer pipe; air outlets are formed in the middles of the front, rear, left and right sides of the top of the oil filler cap; an oil filling pipe is embedded and fixed between the oil filling port cover and the exhaust outer pipe; an oil filling pipe opening is formed in the top of the oil filling pipe, communicating holes are formed in the outer ring of the oil filling pipe opening at equal intervals, fixing grooves are formed in the front, back, left and right sides of the inner side of the oil filling portcover, fixing blocks are embedded in the tops of the fixing grooves, and springs are fixedly connected between the bottoms of the fixing blocks and the fixing grooves. According to the utility model,the annular oil filler cap is arranged, so that the oil filler cap can completely wrap the oil filling gun port and is matched with the communicating hole of the oil filling pipe port, oil is difficult to leak during oil filling, the loss of the oil during oil filling is reduced, and air is protected from being polluted.