The invention discloses a loop-mediated isothermal amplification primer and kit for detecting apium graveolens ingredients and application of the loop-mediated isothermal amplification (LAMP) primer. The base sequence of the loop-mediated isothermal amplification primer is as shown as SEQ ID NO.1-4; an LAMP detection technology is adopted, and a method suitable for detection of specificity of the apium graveolens ingredients in food is created. The method provided by the invention is simple to operate, and does not rely on an expensive instrument, the detection time is about one hour, the sensitivity of the method can reach 0.5 percent, the detection efficiency of the method can reach that of a traditional PCR method or fluorogenic quantitative PCR method, and the method can be applicable to practical work of inspection and quarantine, and especially applicable to rapid preliminary screening of a large number of samples and food quality monitoring in various base laboratories, and suitable for application and promotion as an industrial recommended standard.