The invention relates to a light guide plate film tearing device of an LED (light-emitting diode) lamp, and belongs to the fields of production and manufacturing of LED lamps. According to the light guide plate film tearing device of the LED lamp, an adhesive tape adhered with a coating film on a light guide plate surface layer of the LED lamp is moved by a mechanical arm, the coating film on the light guide plate surface layer of the LED lamp is torn, the adhesion surface of the adhesive tape realizes continuous updating of the adhesion surface of the adhesive tape through a PLC (Programmable Logic Controller) and a corresponding winding device, continuous tearing of the coating film on the light guide plate surface layer film of the LED lamp is realized, the adhesive tape is not need to be changed frequently, and repeated use of the adhesion surface of the adhesive tape is realized. The device realizes the application of appropriate pressure for the adhesive tape through a cylinder and a briquetting spring, tight contact between the adhesive tape and the coating film on the light guide plate surface layer of the LED lamp can be guaranteed, and a light guide plate is prevented from being scratched by excessive pressure or non-uniform force application; the device is small in size, and various sizes of coating films on the light guide plate surface layer of the LED lamp can be torn under the driving of the mechanical arm.