Exhaust fume collecting hood and range hood

The invention provides an exhaust fume collecting hood which comprises an exhaust fume collecting hood body and an exhaust fume collecting cavity arranged in the exhaust fume collecting hood body, openings are formed in the upper end and the lower end of the exhaust fume collecting cavity, and an oil guide structure which extends in the circumferential direction of the opening in the lower end of the exhaust fume collecting cavity and is used for guiding oil dirt on the front side of the exhaust fume collecting cavity to the rear side is arranged on the inner side of the exhaust fume collecting cavity. The oil guide structure which is circumferentially arranged and used for guiding oil dirt on the front side of the smoke collection cavity to the rear side is arranged at the opening in the lower end of the smoke collection cavity, so that the oil dirt in the smoke collection cavity can be conveniently collected, oil dirt accumulation is prevented, and the problem that much oil is stored in an existing range ho