The invention relates to a flat-panel display of a grid-controlled multiple-tilted cathode structure and the making process thereof, comprising: sealed vacuum cavity composed of anode glass panel, cathode glass panel, and peripheral glass frame; anode conducting layer on the anode glass panel and fluorescent powder layer prepared on the anode conducting layer; grid lead layer, carbon nanotube and grid-controlled multiple-tilted cathode structure on the cathode glass panel; supporting wall structure and degassing agent auxiliary component between the anode glass panel and cathode glass panel, and it can further raise electron emission efficiency of carbon nanotube cathode and number of emitted electrons, improve control function of grid, helps to improve display resolution and image quality, and has advantages of stable and reliable making course, simple making process, low making cost, and simple structure.