The present invention provides a gas detection apparatus, which comprises: a gas collection part for collecting a gas to be detected; a detection port arranged at the gas collection part; and a detector for detecting the detected gas at the detection port. According to the present invention, the detected gas, especially the toxic gas, is collected by the gas collection part, and the gas at the detection port is detected by the detector after the collecting is completed, wherein the detected gas is sealed in the gas collection part, such that the contact between the detected gas, especially the toxic gas, and the worker is prevented so as to reduce the potential safety hazard.