The invention discloses a method for synthesizing annular video of 360 degrees for assistant drive of a vehicle. The method adopts a video acquisition unit, an annular video synthesis unit and a display control and storage unit, and has the characteristics of reliable stability, low cost and suitable batch production. The method can acquire video signals in real time for four super-wide-angle fish-eye cameras arranged at front, back, left and right of the vehicle, carries out treatment of fish-eye image correction, annular image mosaic and vision angle conversion on four channels of the video signals through a video decoding unit and a video synthesizing control unit to generate a panoramic displayed plan view of 360 degrees, achieves multiple display modes through the display control and storage unit, and can selectively store correlated video information. The method can provide surrounding scenes for a driver, and eliminate vision blind area thereof, and is favorable for the driver to achieve safe and accurate vehicle driving operations. The method is used for assistant drive for sedans, business vehicles and heavy trucks of various grades, and passenger coaches of different types.