Small telecommunicating module

A small communication module comprises a mainboard, a first electronic component with a strong intensity and a plurality of second electronic components with a weak intensity, which are fixedly arranged on the mainboard respectively, a metal lid, and a back-up block. The metal lid comprises a body, by which the tops of the first electronic component and the second electronic components are covered, and a plurality of support legs which bend from the body and are fixed on the mainboard at a certain interval. The back-up block facing from the body to the first electronic component is positioned on the top of the first electronic component. Thus, when the body receives an external force and results in a concave deformation, the body touches the first electronic component at first and a support structure can be formed by coordinating with each other, thereby preventing the second electronic components from being crushed. The utility model has an advantage of damage rate reduction.