The invention discloses a display panel, a display device and a manufacturing method of the display panel, belonging to the technical field of display, comprising a display area and a non-display area; he non-display area includes a binding area; a first substrate and a second substrate arranged opposite to each other; a thin film transistor array having a gate of the thin film transistor at a first metal layer and a source and drain of the thin film transistor at a second metal layer; A frame glue sandwiched between the first substrate and the second substrate, and the frame glue is located in a non-display area; A metal protective film disposed on the first metal layer or the metal protective film disposed on the second metal layer, and the metal protective film and the binding region are located on different sides of the display region; The metal protective film covers at least a portion of the cutting edge of the first substrate in a direction perpendicular to the display panel. Byutilizing the metal protective film to reflect light energy, the reflectivity of light energy is improved and the manufacturing process is simplified, which has strong practicability.