The work aims to study the effect of sliding friction contact on the bending quality of 1060 pure aluminum busbar to get better surface quality and reduce reject rate. The self-designed friction force testing device for V-shaped three-point free bending forming was adopted to carry out a series of friction tests by changing the corner of the concave die with different surface roughness and different lubricating media to change the contact condition. The surface micro structure of sheet metal bending parts was obtained by tungsten filament scanning microscope. The collected data were fitted by MATLAB software. The curves of bending force and stroke under different roughness of concave die and different lubricating media were obtained. When die fillet surface was smooth and there was no lubrication state, the maximum friction size was about 440 N. When polyethylene film was used as lubricating medium, the maximum friction force size was about 100 N. When polytetrafluoroethylene film was used as lubricating medium, the maximum friction size was about 20 N. When the round angle surface of concave mould is rough, the maximum frictional force was about 235 N without lubrication. When polytetrafluoroethylene film was used as lubricating medium, the maximum frictional force was about 28 N. The addition of lubricating medium can reduce the friction between the plate and the concave die corner effectively, and then improve the forming quality of the surface of the bending parts. Under sliding friction conditions, the surface of bending parts can be effectively improved by the lubrication measures, whether concave die corner is smooth or rough, and the quality of the surface is the best when the PTEF film is used as the lubricating medium.