The invention discloses a rapid diagnostic kit based on a loop-mediated isothermal amplification technique for hepatitis A virus genes and a detection method thereof. The kit comprises two pairs of primers, Bst DNA polymerase, revertase, an RNase inhibitor, a stabilizing solution, a reaction solution, a chromogenic solution and a positive contrast solution, wherein the nucleotide sequences of thetwo pairs of primers are shown in SEQ ID NO: 1-4; and the eight solutions are respectively contained in containers. The kit and the detection method can detect the hepatitis A virus with high efficiency and high specificity, are based on the loop-mediated isothermal amplification technique, apply six segments, four primers and one constant temperature to complete an amplification reaction within less than one hour, and have the advantages of low detection cost, short time consumption, high yield, high specificity, significant chromogenic difference between a positive result and a negative result, high authentication rate, distinctness and reliability.