The invention discloses automatic feeding equipment for laser cutting of sheet metal parts. The automatic feeding equipment comprises a portal frame, a shell is arranged above the portal frame, a first hydraulic air cylinder is fixedly connected to the bottom end of the shell, a fixing frame is fixedly connected to the bottom end of the first hydraulic air cylinder, transverse frames are transversely welded to the front end and the rear end of the fixing frame correspondingly, and a feeding width adjusting mechanism is arranged at the top ends of the transverse frames. According to the automatic feeding equipment for laser cutting of the sheet metal parts, limiting holes, square sleeves, adjusting hand wheels, fixing rods, suction cups, air pipes, a mounting plate and a vacuum air pump are arranged, when the automatic feeding equipment is used, according to the size and the width of a sheet metal, the adjusting hand wheels are unscrewed firstly, then the square sleeves slide, the suction cups are evenly distributed above sheet metal, then the adjusting hand wheels are screwed, the adjusting hand wheels are clamped into limiting holes to complete fixing, the function of flexibly adjusting the positions of the suction cups to adapt to the size of the sheet metal is achieved, and the problem that the device does not have the function of flexibly adjusting the positions of the suction cups to adapt to the size of the sheet metal is solved.