Gas sampling device for environmental monitoring

The invention provides a gas sampling device for environmental monitoring. The gas sampling device comprises a sampling head, a gas collecting bottle, a piston and a connecting rod, the gas collectingbottle is arranged on the sampling head, a gas inlet channel and a water discharging channel which are communicated with the gas collecting bottle are arranged in the sampling head, gas can be injected into the gas collecting bottle from the gas inlet channel, water in the gas collecting bottle can be replaced by the gas and discharged out of the sampling head along the water discharging channel,and the gas injected from the gas inlet can completely replace the water in the gas collecting bottle; a piston is installed in the gas collecting bottle and connected with a connecting rod, and thepiston can be controlled to block the bottle opening by operating the connecting rod. The sampling device is simple in structure and convenient to operate, gas is used for displacing water in the gascollecting bottle, gas colle