The invention relates to a flue gas quick sampling and automatic switching group valve device. The device comprises a housing, and sixteenth-path sampling tube interfaces, a power cable, a control cable, main pump and auxiliary pump flow control buttons, a main pump and auxiliary pump outlet nozzle, which are mounted on the housing. The inside of the housing is provided with sixteen paths of intake pipes and intake solenoid valves on the intake pipes; each intake pipe is divided into two paths by a pipeline tee joint, one path is connected with a main pump intake through a main pump solenoid valve, and the main pump outlet is connected to a main pump outlet nozzle through a pipeline; the other path is connected to an auxiliary pump intake through the auxiliary pump solenoid valve, and the auxiliary pump outlet is connected with an auxiliary pump outlet nozzle through the pipeline; and all solenoid valves and switch status of the main pump and auxiliary pump are controlled by the control cables. The device can be connected to 16 sampling tubes, saves waiting time, greatly simplifies operation process, and reduces the input of testing personnel.