The utility model discloses a protection casing for comprehensive sample thief of atmosphere, including the quick -witted box cover who is used for holding quick -witted case, quick -witted box cover's bottom is not sealed, and quick -witted box cover's top is equipped with the hole, and quick -witted box cover top is equipped with many vaulting poles, and all vaulting poles prop up and prop up a roof, and the space that constitutes between all vaulting poles and the roof is used for holding the cutting head. The utility model discloses a protection casing bottom is not sealed, because the gas outlet of sample thief also in the bottom, can effectively avoid gas outlet gas to get into the sample thief air inlet again like this, helps the heat dissipation of sample thief simultaneously, the convenient dismantlement yet. The utility model discloses a space that constitutes between vaulting pole and the roof is unlimited all around for the cutting head exposes in the atmosphere, has improved the accuracy of sampling.