The present invention discloses an assembly method for backlight module and assembly equipment thereof. The method includes: stacking reflector, light-guiding plate and optical film to form a component entirety and fixing the component entirety; fixing at least two main connection elements in head-to-tail manner to form a back plate on four sides around the component entirety so as to fix reflector, light-guiding plate and optical film to corresponding position on the back plate respectively. The method is suitable for realization with automatic equipment. Through automatic equipment to assemble backlight module, the assembly efficiency can be improved to reduce the labor required for backlight module assembly and reduce labor cost.