The invention relates to a flat-panel display of a sharp-angled lower grid-controlled 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; supporting wall structure and degassing agent auxiliary component between the anode glass panel and cathode glass panel; and grid lead layer, carbon nanotube and sharp-angled lower grid-controlled cathode structure on the cathode glass panel; and it can effectively reduce operating voltage of grid structure and raise electron emission efficiency of carbon nanotube and has advantages of stable and reliable making course, simple making process, low making cost, and simple structure.