Brush cutter head (10) comprising a cylindrical housing (13) provided with at least one pair of diametrically opposed holes (14 and 15), for the entry and exit of a cutting wire (16), said holes (14 and 15 ) being provided with inlet and outlet bushings (41 and 42) of the thread, and a spool (20) disposed within the housing (13), which spool (20) can be rotated with respect to the housing (13) , where the reel (20) comprises unpar flanges (21 and 22) between which a wall (23) is interspersed to define, together with said flanges (21 and 22), annular spaces (24 and 25) each of them intended to wind a half of the thread (16), the wall (23) exhibiting a thread guide channel comprising two parts (27 and 28), the latter parts being an input part and an output part of the thread (16), characterized in that said parts (27 and 28) are arranged according to directions that do not pass through a rotation axis of the reel and (20), said parts (27 and 28) being misaligned with respect to the holes (14 and 15) and with respect to the bushings (41 and 42) of the housing (13).Cabezal de desbrozadora (10) que comprende una carcasa cilíndrica (13) provista de por lo menos un par deorificios (14 y 15) diametralmente opuestos, para la entrada y la salida de un hilo de corte (16), dichos orificios (14 y15) estando provistos de casquillos de entrada y de salida (41 y 42) del hilo, y un carrete (20) dispuesto dentro de la carcasa (13), el cual carrete (20) puede ser girado con respecto a la carcasa (13), donde el carrete (20) comprende unpar de bridas (21 y 22) entre las cuales está intercalada una pared (23) para definir, junto con dichas bridas (21 y 22),espacios anulares (24 y 25) cada uno de ellos destinado a enrollar una mitad del hilo (16), la pared (23) exhibiendo uncanal de guía del hilo que comprende dos partes (27 y 28), estas últimas partes siendo una parte de entrada y unaparte de salida del hilo (16), caracterizado por el hecho que dichas partes (27 y 28) están dispuestas se
