Objective To evaluate the application value of smartphone level meter combined with laser guidance device in CT-guided percutaneous lung puncture. Methods A historical control study was conducted， and enrolling 60 patients who underwent CT-guided lung puncture at the Fourth Affiliated Hospital of Anhui Medical University from October 2023 to July 2025. A total of 60 patients （45 males， 15 females） with a mean age of （72.90 ± 8.82） years were included. 30 patients who underwent CT-guided lung puncture， and 30 patients who received smartphone level meter-assisted procedures as the experimental group. The following parameters were compared between the two groups： coaxial needle insertion attempts， pneumothorax incidence， bleeding severity， puncture duration， and achievable puncture angle. Results The experimental group demonstrated significantly fewer coaxial needle insertion attempts ［1.00 （1.00， 2.00） vs. 2.00 （2.00， 3.00）， P < 0.001］， lower pneumothorax incidence （13.3% vs. 36.6%， P = 0.037）， shorter puncture duration ［（24.90 ± 4.68）min vs. （29.93 ± 10.11）min， P = 0.02］， and larger achievable puncture angles ［19.50° （7.75°， 41.00°） vs. 7.00° （1.75°， 25.25°）， P = 0.04］ compared to the control group. No statistically significant difference was observed in bleeding severity （P = 0.481）. Conclusions The combination of a smartphone level meter and laser guidance device effectively reduces the number of coaxial needle insertion attempts， lowers the incidence of pneumothorax， shortens the procedure duration， and enables a wider achievable puncture angle in CT-guided percutaneous lung puncture. This technique shows promising clinical application value for improving the safety and efficiency of the procedure.