The disclosure provides cigarette packet tightness detection equipment and a cigarette packet tightness detection method. The cigarette packet tightness detection equipment comprises a detection chamber, a pressure regulating chamber, a stop valve, pressure regulating equipment, a pressure sensor, and a differential pressure instrument. The detection chamber is used for placing a to-be-detected cigarette packet and has a detection state of airtight isolation from the outside of the cigarette packet tightness detection equipment. The pressure regulating chamber is used for regulating the pressure of the detection chamber and has a detection state of airtight isolation from the outside of the cigarette packet tightness detection equipment. The stop valve is connected between the detection chamber and the pressure regulating chamber and is used for controlling the connection or disconnection of the detection chamber and the pressure regulating chamber. The pressure regulating equipment connected with the pressure regulating chamber is used for regulating the pressure of the pressure regulating chamber. The pressure sensor is used for measuring the pressure of the pressure regulating chamber. The differential pressure instrument connected between the detection chamber and the pressure regulating chamber is used for measuring the differential pressure between the detection chamber and the pressure regulating chamber so as to represent the cigarette packet tightness of a to-be-detected cigarette packet. According to the cigarette packet tightness detection equipment and the cigarette packet tightness detection method, the cigarette packet tightness can be accurately represented on the premise that the cigarette packet is not damaged.