The invention discloses a lighting tube supporting frame of a backlight module. The lighting tube supporting frame is provided with at least one closed clamping space which is identified by at least one group of the upper clamping space of a lower clamping part and the upper clamping space of an upper clamping part and is used for stably clamping and positioning at least one backlight source lighting tube, and the upper clamping part assembles and combines the lower clamping part in pivotal way of flexible link connecting part. Therefore, the invention can surely prevent a backlight source lighting tube from separating from the lighting tube supporting frame and is beneficial to improving the assembly reliability of the backlight source lighting tube and the impact test yield of the backlight source lighting tube.