The present invention relates to a micro electromechanical component and a manufacturing method thereof. A manufactured micro electromechanical component comprises a membrane structure and a protrusion, wherein the membrane structure is deposited according to random sequence and comprises at least one metal layer and one protection layer; and the protrusion is connected below the membrane structure. The protrusion is made of metal and comprises a layer of metal layer and a layer of path layer The preferable membrane structure at least comprises a lower protection layer, a metal layer and an upper protection layer to form a three-layer type membrane structure. The micro electromechanical component is suitable for being used for manufacturing a capacitive micro sound pressure sensor.