Food and crops are sourced primarily from agriculture, and due to the enormous growth in population, agricultural goods are in great demand, while farmland is being developed for residences. Therefore, certain chemicals, like pesticides, are being overused and have become unavoidable to increase crop productivity and storage. Excessive release of pesticides into the environment and food chain may pose a health risk. Food and agricultural products need routine analyses to monitor the level of pesticide residuals. As pesticide detection techniques are labor-intensive and require highly qualified professionals, an alternative technique must be developed, such as analytical nanotechnology. The most commonly used nanomaterials for pesticide delivery, enrichment, degradation, detection, and removal are metals, clays, polymers, and lipids. In colorimetric analysis of pesticides, metal nanoparticles are widely used which are quick, easy, and do not require any sample preparation. This manuscript compiles the latest research on nanotechnology in pesticide formulation and detection for smart farming.