A processing head (1) for surface processing by means of a laser beam is disclosed. The processing head (1) comprises a through passage (2) for a laser having a longitudinal axis (A), at least one powder supply passage (3) and a cooling passage (4) for cooling the processing head (1). The processing head (1) is at least configured of two parts and comprises a body (5) and a sleeve (6). The sleeve (6) is suitable for the arrangement at the body (5). The through passage (2) of the laser and the powder feed channel (3) are configured in the body (5). The body (5) at least partly forms a first sidewall of the cooling passage (4). The sleeve (6) at least partly forms a second sidewall of the cooling passage (4).