The invention relates to a deposition head for continuous coaxial deposition with in-situ synthesis of nanoparticles, which makes possible nanopowder alloying upon deposition of micrometric powder of SiC or carbon nanoparticles or carbon nanotubes, using high power laser, with application in applied engineering, information engineering, industrial engineering, mechatronic engineering, nano engineering, system engineering and the like. According to the invention, the deposition head comprises a laser beam focusing module (MF) with electro-mechanical interface which ensures modification/adjustment of collimated laser beam focus length (Lf) and, at the same time, can perform the displacement on two directions in a plane, needed for the alignment/coaxialization of focuses used in the deposition, taking the edge of the deposition head as a reference point, an optical system of the focusing module (MF) being protected by a protective glass (PG) the temperature of which is controlled by a temperature sensor, being washed and protected by a pressurized neutral gas (PGO) which, through the diaphragm (AF) reaches the process zone, the gas injection channels being defined by some components (A, B and C), the protective glass (PG) allowing the monitoring of the supply of precursor gases SiH/CH/Ar into the channels, it has a zone (PWF) for supply with micrometric deposition powder, a gas (ArSH) protecting and insulating the process zone, the nanoparticle synthesis zone being defined by the focus of precursor gas injection for the synthesis of nanoparticles (NP) while the deposition zone (ZD) is defined by the distance between the deposition head and the base material (MB).