A process for the production of light olefins and BTX starting from a naphtha cut with an initial boiling point of more than 30°C and a final boiling point of less than 220°C, said process comprising a catalytic cracking unit processing a light naphtha type feed (30-T M °C), a catalytic reforming unit processing a feed termed a heavy naphtha (T M °C - 220°C), and an aromatics complex supplied with effluents from catalytic reforming and the 60+ fraction of the NCC effluents, the catalytic cracking unit operating with the following operating conditions: reactor outlet temperature in the range 500°C to 750°C, and ratio of the mass flow rate of catalyst to the mass flow rate of feed (C/O) in the range 5 to 40, and the catalyst used in the NCC unit comprising a proportion of ZSM-5 zeolite equal to at least 10% by weight with respect to the total catalyst, said process comprising the following series of operations: • sending the naphtha feed with an initial boiling point of at least 30°C and a final boiling point of at least 220°C to a hydrotreatment unit which can eliminate the sulphur-containing and nitrogen-containing compounds it contains; • sending the hydrotreated naphtha feed to a separation unit (SPLIT1) which can separate a light fraction termed light naphtha, with a distillation range of 30°C - T M °C, and a heavy fraction termed heavy naphtha with a distillation range of T M °C - 220°C, in which T M °C is in the range 80°C to 160°C, preferably in the range 100°C to 150°C, and highly preferably in the range 110°C to 140°C; • sending the light naphtha to the NCC as a feed; • sending the heavy naphtha as a feed for the catalytic reforming unit; • separating the effluents from the NCC in a fractionation unit (FRAC) which can separate a light fraction which is sent to a separation termed the cold box separation,, which can isolate H 2, CH 4 and the C 2, C 3 and C 4 light paraffins on the one hand, and ethylene and propylene on the other hand; • sending the heavy fraction obtained from the separator (FRAC) as a mixture with the effluents 5 from the catalytic reforming REF as a feed 10 for the aromatics complex AC; • from the aromatics complex, extracting the BTX compounds, a fraction termed heavy aromatics which is sent as a mixture with the light naphtha as a feed for the NCC, and a raffinate, defined as the non-aromatic portion of the effluents, which is sent to a separation unit (SPLIT2) which can separate a light fraction which is sent, as a mixture with the light naphtha feed, to the catalytic cracking unit, and a heavy fraction which is sent, as a mixture with the heavy naphtha feed, to the catalytic reforming unit. • sending the naphtha feed with an initial boiling point of at least 30°C and a final boiling point of at least 220°C to a hydrotreatment unit which can eliminate the sulphur-containing and nitrogen-containing compounds it contains; • sending the hydrotreated naphtha feed to a separation unit (SPLIT1) which can separate a light fraction termed light naphtha, with a distillation range of 30°C - T M °C, and a heavy fraction termed heavy naphtha with a distillation range of T M °C - 220°C, in which T M °C is in the range 80°C to 160°C, preferably in the range 100°C to 150°C, and highly preferably in the range 110°C to 140°C; • sending the light naphtha to the NCC as a feed; • sending the heavy naphtha as a feed for the catalytic reforming unit; • separating the effluents from the NCC in a fractionation unit (FRAC) which can separate a light fraction which is sent to a separation termed the cold box separation,, which can isolate H 2, CH 4 and the C 2, C 3 and C 4 light paraffins on the one hand, and ethylene and propylene on the other hand; • sending the heavy fraction obtained from the separator (FRAC) as a mixture with the effluents 5 from the catalytic reforming REF as a feed 10 for the aromatics complex AC; • from the aromatics complex, extracting the BTX compounds, a fraction termed heavy aromatics which is sent as a mixture with the light naphtha as a feed for the NCC, and a raffinate, defined as the non-aromatic portion of the effluents, which is sent to a separation unit (SPLIT2) which can separate a light fraction which is sent, as a mixture with the light naphtha feed, to the catalytic cracking unit, and a heavy fraction which is sent, as a mixture with the heavy naphtha feed, to the catalytic reforming unit.