The invention discloses a display panel, a preparation method thereof and a display device. The display panel comprises a first substrate and a second substrate, and the first substrate and the secondsubstrate are arranged in a box-to-box mode, wherein a grid driving circuit is arranged on the first substrate and comprises a first semiconductor switch device, a reflecting structure layer corresponding to the first semiconductor switch device is arranged on one side of the second substrate which faces the first substrate, and the reflecting structure layer is used for reflecting the light irradiated to the reflecting structure layer to the first semiconductor switch device. The display device comprises the display panel and further comprises a backlight source arranged on one side, away from the second substrate, of the first substrate. The reflecting structure layer can reflect the light irradiated by the backlight source to the first semiconductor switch device, so that the conduction characteristic of the first semiconductor switch device is improved, the driving capability of the grid driving circuit is improved, and the shaking transverse grains of the display panel are avoided.