An organic light-emitting diode (OLED) illuminating lamp sheet and a manufacturing method thereof are provided. The method for manufacturing an OLED illuminating lamp sheet includes: manufacturing an array substrate, the array substrate includes a first base and a first electrode formed on the first base; bonding an electrostatic film to a surface of the array substrate provided with the first electrode, forming a patterned electrostatic film by patterning the electrostatic film, and forming an organic film layer by taking the patterned electrostatic film as a mask; forming a second electrode and obtaining an OLED element; and encapsulating the OLED element and obtaining an OLED illuminating lamp sheet.