Tail gas collecting device for automobile tail gas detection and with full collection prompting function

The utility model discloses a tail gas collecting device for automobile tail gas detection with a full collection prompting function, which belongs to the field of tail gas collecting equipment.The tail gas collecting device for automobile tail gas detection with the full collection prompting function is characterized in that a main air bag is sleeved on a gas collecting bottle, and an air overflow hole communicated with the main air bag is formed in the gas collecting bottle; when the movable block slides to the bottom of the gas collection bottle, the interior of the gas collection bottle is full of tail gas, but the tail gas of the automobile continues to be exhausted outwards to a certain extent, when the tail gas continues to be introduced, the tail gas enters the main air bag from the gas overflow hole, the elastic main air bag can contain more tail gas, and meanwhile the occupied space can be reduced when the automobile is not used; the expanded main air bag can play a better prompting role, the auxili