The invention discloses an oil collecting box of a range hood, and relates to the technical field of household appliances. The oil collecting box of the range hood comprises an oil collecting box body, wherein a first groove is formed in the lower end surface of the oil collecting box body along the diameter of the lower end surface of the oil collecting box body; the section of the first groove is rectangular; the section of the oil collecting box body is round, the section area close to the upper end of the oil collecting box body is larger than the section area close to the lower end of the oil collecting box body; second grooves are formed in the side faces, opposite to each other, of the oil collecting box body along the height direction; and the section of the first grooves is rectangular. According to the oil collecting box of the range hood, grooves with rectangular sections are formed in the lower portion and the side portion of the oil collection box, acting points are easily found during the disassembling and assembling process; a tool matched with the acting points is used so that a use can avoid to make direct contact with the oil collecting box; and thus dismounting and mounting are convenient.