Triple-crossed horizontal folding cart

A triple-crossed horizontal folding cart, comprising:

• a cart frame;
• wherein the cart frame comprises a frame body formed by a front wall, a rear wall, and two symmetrical side walls;
• a chassis disposed at a bottom of the frame body;
• wherein a left end and a right end of the front wall being each provided with a wheel;
• wherein a left end and a right end of the rear wall being each provided with a wheel;
• wherein a front end and a rear end of the chassis are rotatably connected to the front wall and the rear wall respectively;
• wherein each of the side walls comprises a front cross tube, a middle cross tube and a rear cross tube all of which are rotatably connected in sequence;
• wherein a first and second straight tubes of each said cross tube are rotatably connected;
• wherein an upper and lower sides of the front cross tube are rotatably connected to the front wall and the chassis respectively;
• and
• wherein an upper and lower sides of the rear cross tube are rotatably connected to the rear wall and the chassis respectively.