A bottom cup cover, comprising: a gas intake assembly provided with a first gas intake channel, a connecting channel and a second gas intake channel, the connecting channel connecting the first gas intake channel and the second gas intake channel, the second gas intake channel being obliquely arranged relative to the first gas intake channel, and the first gas intake channel having a gas inlet; a first primary air supplement cavity and a second primary air supplement cavity being defined in the bottom cup cover, the first primary air supplement cavity being separated from the second primary air supplement cavity, the first gas intake channel being in communication with the first primary air supplement cavity, the second gas intake channel being in communication with the second primary air supplement cavity, and the connecting channel being configured to enable a gas flow to circulate between the first gas intake channel and the second gas intake channel, and being characterised by further comprising: a first supplement part, a first mixing part and a second supplement part, the gas intake assembly comprising a first gas intake part, a second gas intake part and a connecting part, the connecting part connecting the first gas intake part and the second gas intake part; the first gas intake part, the first supplement part and the first mixing part being connected sequentially, the second supplement part being connected above the first mixing part, the second gas intake part penetrating the first supplement part and the second supplement part, and the connecting part being arranged at an outer side wall of the first supplement part; the first supplement part defining the first primary air supplement cavity, the second supplement part defining the second primary air supplement cavity, the first mixing part defining a first groove in communication with the first primary air supplement cavity, the first groove penetrating through the first mixing part in an axial direction of the first gas intake channel, the first gas intake part defining the first gas intake channel, the second gas intake part defining the second gas intake channel, and the connecting part defining the connecting channel. a gas intake assembly provided with a first gas intake channel, a connecting channel and a second gas intake channel, the connecting channel connecting the first gas intake channel and the second gas intake channel, the second gas intake channel being obliquely arranged relative to the first gas intake channel, and the first gas intake channel having a gas inlet; a first primary air supplement cavity and a second primary air supplement cavity being defined in the bottom cup cover, the first primary air supplement cavity being separated from the second primary air supplement cavity, the first gas intake channel being in communication with the first primary air supplement cavity, the second gas intake channel being in communication with the second primary air supplement cavity, and the connecting channel being configured to enable a gas flow to circulate between the first gas intake channel and the second gas intake channel, and being characterised by further comprising: a first supplement part, a first mixing part and a second supplement part, the gas intake assembly comprising a first gas intake part, a second gas intake part and a connecting part, the connecting part connecting the first gas intake part and the second gas intake part; the first gas intake part, the first supplement part and the first mixing part being connected sequentially, the second supplement part being connected above the first mixing part, the second gas intake part penetrating the first supplement part and the second supplement part, and the connecting part being arranged at an outer side wall of the first supplement part; the first supplement part defining the first primary air supplement cavity, the second supplement part defining the second primary air supplement cavity, the first mixing part defining a first groove in communication with the first primary air supplement cavity, the first groove penetrating through the first mixing part in an axial direction of the first gas intake channel, the first gas intake part defining the first gas intake channel, the second gas intake part defining the second gas intake channel, and the connecting part defining the connecting channel. a first supplement part, a first mixing part and a second supplement part, the gas intake assembly comprising a first gas intake part, a second gas intake part and a connecting part, the connecting part connecting the first gas intake part and the second gas intake part; the first gas intake part, the first supplement part and the first mixing part being connected sequentially, the second supplement part being connected above the first mixing part, the second gas intake part penetrating the first supplement part and the second supplement part, and the connecting part being arranged at an outer side wall of the first supplement part; the first supplement part defining the first primary air supplement cavity, the second supplement part defining the second primary air supplement cavity, the first mixing part defining a first groove in communication with the first primary air supplement cavity, the first groove penetrating through the first mixing part in an axial direction of the first gas intake channel, the first gas intake part defining the first gas intake channel, the second gas intake part defining the second gas intake channel, and the connecting part defining the connecting channel.