Soil petroleum hydrocarbon detector system and soil petroleum hydrocarbon content in-situ detection method

The invention discloses a soil petroleum hydrocarbon detector system and a soil petroleum hydrocarbon content in-situ detection method, and the system comprises a double-excitation LED lamp bead which is used for emitting an excitation light source to excite a fluorescence signal of pollutants in a soil sample; the collimating lens is used for collimating light paths of the double-excitation LED lamp beads; the impurity removal optical filter is used for filtering the excitation light source and removing stray light interference; the triangular prism is used for changing the irradiation direction of the filtered excitation light source; the focusing lens is used for focusing the excitation light source of which the irradiation direction is changed on the soil sample to form a 1cm < 2 > light spot area; the converging lens is used for converging fluorescence excited by the soil sample; the screening optical filter is used for screening fluorescence signals with wavelengths in a fluorescence peak detection matr