Abstract: A signal filtering and concentration inversion method for infrared laser detection, implemented through a signal filtering and concentration inversion system for infrared laser detection, includes the following steps: S1, building a transmissive-type infrared laser gas detection system at an on-site detection location, setting fixed parameter information, and establishing normal communication on an optical detection part and obtaining a first-harmonic signal; S2, performing amplification-processing on the first-harmonic signal to obtain a second-harmonic signal, and introducing the second-harmonic signal into a laser filtering-processing model to obtain a denoised second-harmonic signal; S3, inputting the first-harmonic signal and the denoised second-harmonic signal into a concentration inversion model to obtain a concentration signal of a to-be-detected gas; and S4, determining, based on the concentration signal of the to-be-detected gas, whether a hazardous gas limit has been exceeded at the on-site detecti