Pesticide is one of the best substances that are widely used in the agriculture field to control pest. Though pesticides are basically used to control pest but improper use of pesticide on crops can be harmful for the consumers. Carbendazim and Mancozeb+Metalaxyl are the active ingredient of Knowin and Ridomil gold and these pesticides were extensively used in Bangladesh for controlling pest and fungus. In this study the active ingredients of pesticide were detect from the soil and crops after harvesting by using QuEChERs method and sample were analyzed by Fourier Transform Infrared Spectroscopy (FTIR). By identifying and matching common functional group both of samples and pesticides at 1050 cm-1, 1450 cm-1, 1650 cm-1, 1840 cm-1, 2920 cm -1 and 3350 cm-1 intensity pesticides active ingredients were identified into samples. The results show that WHO class II pesticides are the most frequently used pesticides in the study area. Total 2 number of pesticide (1 Insecticide &1 Fungicide) were found into both soil and carrot samples. Food contamination is the biggest challenge for any developing country in the world like Bangladesh. It may be stated that the pesticide management techniques of the vegetable producers in the study area were inadequate. So, initiatives to improve farmers' pesticide understanding through increased training are critical and should be promoted by relevant stakeholders. Furthermore, authoritarian enforcement of pesticide sales restrictions should be implemented to raise farmers' ability on safety concerns.