Device for sampling toxic gas or harmful gas

The utility model provides a toxic and harmful gas sampler, which comprises a sample can 1 and a valve 2 which is connected with the opening of the sample can, wherein, the valve 2 is connected with a connecting pipe 3, the other end of the connecting pipe 3 is connected with a three-way valve 4, and the three-way valve 4 is also connected with a waste gas collecting pipe 5 and a connecting pipe 6. An on site discharge amount is reduced as much as possible, not only the environment is protected, but also the potentiality of an accident is reduced. Because the waste gas collecting pipe can suck in the dead volume air of a connecting pipe point and the dead sample of a sample collecting point, the accuracy of a sample is enhanced.