The invention discloses a kitchen ventilator and a control method thereof. The method is carried out through a device comprising a device body, a starting device arranged in the device body, a cleaning device arranged in the device body, and a smoke exhausting device arranged in the device body, wherein the starting device comprises a first sliding chamber which is arranged in the device body. Thekitchen ventilator solves the problems that washing a kitchen ventilator always troubles people in daily life, stubborn oil and stains are hard to wash after the kitchen ventilator is operated for aperiod of time; an oil collecting net cover plate needs to be dismounted for washing, and the operation is complex; and meanwhile, the kitchen ventilator is large in size and occupies certain space ina kitchen, and the aesthetics is influenced. According to the kitchen ventilator and the control method thereof, the oil collecting net cover plate is automatically subjected to oil and stain removing after being used, and the operation of manual dismounting and then manual washing is avoided; and meanwhile, a hiding function is provided, namely, the kitchen ventilator can be hidden in a wall body when not in use, so that the space is saved to the maximum, and the aesthetics can be improved.