The invention discloses a food processing method of a food processor and the food processor, and relates to the field of food processing. The food processor comprises a machine base provided with a motor and a circuit board, a vacuum pump, a mixing cup, a grinding cutter, a pressure relief module used for pressure relief of the mixing cup and a sealing module used for sealing the mixing cup. The circuit board is provided with a control circuit. The food processing method at least comprises the steps that a intermittent vacuum extraction step is performed, specifically, the sealing module sealsthe mixing cup, then the vacuum pump works to extract air in the mixing cup to enable the mixing cup to be in a negative pressure state and then the vacuum pump stops working, then the pressure relief module performs pressure relief on the mixing cup, and the intermittent vacuum pumping step is executed repeatedly; and a crushing step is performed, specifically, the motor drives the grinding cutter to rotate to crush materials in the mixing cup. According to the food processing method, no burnt bottom and less foam are achieved, and the noise is low.