A 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 sheet folding trailer comprises front-frame component and rear-frame component, the front-frame component comprises a front-frame U-shaped tube, a front-frame horizontal tube, a tri-glide button a, and a tri-glide button b, the front-frame U-shaped tube and the front-frame horizontal tube are fixed together by welding to form a rectangular frame of the front-frame component, the tri-glide button a and tri-glide button b are arranged at two ends of the front-frame U-shaped tube respectively, and simultaneously, the horizontal height of the tri-glide button a and tri-glide button b is the same, the rear-frame component comprises a rear-frame U-shaped tube, a rear-frame horizontal tube, a tri-glide button c, and a tri-glide button d, the pocket component is arranged between the front-frame component and the rear-frame component, one end of the pocket component is fastened to the tri-glide button a and tri-glide button b on top of the front-frame U-shaped tube through mesh belt respectively, the other end of the pocket component is fastened to the tri-glide button c and tri-glide button d on top of the rear-frame U-shaped tube through mesh belt respectively, four mesh belts are provided, and are fixed on edge of the pocket component by sewing, the bottom-frame component comprises front bottom-frame component, rear bottom-frame component, bottom-frame U-shaped hinge, and drive tube component, wherein the front bottom-frame component comprises front bottom-frame elbow a, front bottom-frame elbow b, and front bottom-frame horizontal tubes, ends of the front bottom-frame elbow a and the front bottom-frame elbow b are connected to the front-frame U-shaped tube by rivets to form a foldable mechanism, the front bottom-frame horizontal tubes comprise three horizontal tubes with different lengths, and the horizontal tubes are vertically arranged between the front bottom-frame elbow a and the front bottom-frame elbow b, the drive tube component comprises front bottom-frame drive tube a, front bottom-frame drive tube b, rear bottom-frame drive tube a, rear bottom-frame drive tube b, and sliding sleeves, the sliding sleeves are provided with four, comprising sliding sleeve a, sliding sleeve b, sliding sleeve c, and sliding sleeve d, the front bottom-frame drive tube a is arranged at one side of the front bottom-frame elbow a, the front bottom-frame drive tube a and the front bottom-frame elbow a are connected by a rivet, and a folding rotation point is formed at the rivet connection, one end of the front bottom-frame drive tube a is connected to the front-frame U-shaped tube through the sliding sleeve a, a rotatable hinge connection is formed between the front bottom-frame drive tube a and the sliding sleeve a by a hinge pin, and a hinge connection is provided between the front bottom-frame drive tube a and the rear bottom-frame drive tube a by a rivet, the wheel component comprises universal wheel fork a, universal wheel fork b, directional wheel fork a, directional wheel fork b, torque tube a and torque tube b, wherein the universal wheel fork a, the universal wheel fork b, the directional wheel fork a and the directional wheel fork b are respectively provided with rubber wheel, the universal wheel fork a is arranged on bottom side surface of the front-frame horizontal tube, the torque tube a is arranged between the universal wheel fork a and the front-frame horizontal tube, the torque tube a is arranged in vertical direction and is connected to the front-frame horizontal tube by welding, the directional wheel fork a is arranged at bottom end of the rear-frame horizontal tube and is fixed and connected to the rear-frame horizontal tube by welding, the handle component is arranged at one side of the front-frame component, the handle component and the front-frame component are connected through a linkage component.