The invention provides a control method and a control system of a cooking device. The control method comprises the steps that step 102, a material feed instruction is received, and materials with preset weights are put into a rice washing box of the cooking device; step 104, a first liquid feed instruction is received, and a first preset amount of water is injected into the rice washing box; step 106, a cleaning instruction is received, a material cleaning device of the cooking device is driven to carry out material cleaning; step 108, a sewage discharge instruction is received, the material cleaning is stopped, and water in the rice washing box is discharged; step 110, a material discharging instruction is received, a ball valve of the rice washing box is switched on, the materials in the rice washing box are discharged into an inner pot of the cooking device; step 112, a second liquid feed instruction is received, the ball valve is switched off after a second preset amount of water is put into the rice washing box. According to the control method, the process of automatic cleaning and discharging of the materials is achieved, the operation steps are simplified, the automation degree of the cooking device is increased, and the cleanliness of the material and the safety of food are improved.