Abstract: Fixed outer barbecue modular structure for cooking food, comprising three modulus, a first base modulus which defines a lower larder modulus defined by a base panel, to which two side panels are assembled, a closing back plate and two manhole doors; a second modulus which defines cooking means comprising an inserted base over the former modulus to which two sides are assembled, a bottom plate, a closing rear plate, a barbecue plate and a metallic grate; and finally a third an last modulus comprising an inserted base over the former modulus, wherein a fumes hood and a cowl diffuser are assembled.