The invention discloses a novel sheet folding trailer, comprising pocket component, front-frame component, rear-frame component, bottom-frame component, wheel component, handle component, wherein vertical skeleton unit of the invention comprises front-frame component and rear-frame component, the pocket component is arranged between front-frame component and rear-frame component, the bottom-frame component comprises front bottom-frame component, rear bottom-frame component, bottom-frame U-shaped hinge, drive tube component, the wheel component comprises universal wheel fork a, universal wheel fork b, directional wheel fork a, directional wheel fork b, torque tube a, torque tube b, the handle component is arranged at one side of front-frame component, the handle component and the front-frame component are connected through linkage component. Through structural optimization, the invention has a small folding height, a large capacity after opening, and has a simple side structure by adopting only two parts, which effectively reduces the product cost, moreover, the folding height thereof will not change.