The invention discloses a laser remote sensing detector for natural gas concentration and distance. The detector comprises infrared laser transmitting and receiving components and a control processing component electrically connected with the infrared laser transmitting and receiving components; particularly, the control processing component comprises a transmitting signal control assembly and a receiving signal processing assembly which are electrically connected; the transmitting signal control assembly is used for achieving modulation of output of a laser (7) in the infrared laser transmitting component; the receiving signal processing assembly comprises a distance signal processing unit and a concentration signal processing unit which are electrically connected with a detector (14) in the infrared receiving component, wherein the distance signal processing unit is used for working out the distance between a reflector (12) and the infrared receiving component, and the concentration signal processing unit is used for working out the gas concentration. The detector has the high precision for natural gas concentration detection, and can be widely applied to accurate positioning and detection of natural gas leakage.