The invention discloses a calibration method of an automobile lane deviation early warning system, and a method. The calibration apparatus comprises a calibration object plate, a diagnosis instrument, a lane deviation early warning system and a positioning tool. The positioning tool comprises a positioning support and a positioning mechanism, the positioning support comprises a vertical frame and a horizontal frame vertically welded to the lower end of the vertical frame, the lower portion of the vertical frame is provided with transverse barrier strips, the calibration object plate is vertically installed at the central portion of the vertical frame and is staggered from the transverse barrier strips in a parallel mode, the positioning mechanism comprises a bearer, a transmission shaft, a handle, a rear, a first connecting rod, a second connecting rod, and a first clamping rod and a second clamping rod which are inverted-L-shaped, and the axial lead of the transmission shaft and the extension line of the vertical center line of the side surface of the calibration object plate are vertically intersected. The calibration object plate is positioned through a mode of clamping two front wheels of an automobile by use of the first clamping rod and the second clamping rod, the operation is convenient, the mobility is good, and calibration result errors can be reduced.