The sewage drug detector was developed to solve the pain point of front-line police officers unable to trace the source of the drug situation. It is miniaturized, easy to carry, and has fast test results. It also has functions such as data storage, uploading, printing, and self-checking. Two-dimensional code recognition can be added, and an external camera can be used to realize the function of taking photos and forensics. It has a built-in 4G module and can connect to WiFi to upload test results to the cloud. It is suitable for quickly obtaining preliminary screening results for some suspicious water samples. According to the test results, it can quickly Determine whether there are crowded drug abuse or drug production dens in the testing site.