Heat-dissipating element, manufacturing method and backlight module thereof

A manufacturing method of heat-dissipating element, which comprises:

• processing a heat-dissipating element body with a bottom plate and at least two stop plates, the stop plates being disposed at two sides of the bottom plate and bending towards surface;
• cutting from the bottom plate of the heat-dissipating element body at a position between the two stop plates to form heat-dissipating element, the dissipating element at least comprising two heat-dissipating elements of same shape or of symmetric shape, wherein each of the two heat-dissipating elements comprises a corresponding one of the two stop plates disposed at one side of the bottom plate of the heat-dissipating element, the bottom plate of the heat-dissipating element comprises two parallel top edge and bottom edge located at two opposite ends connecting the one side of the bottom plate of the heat-dissipating element, length of the top edge is greater than length of the bottom edge.