A trace explosive and drug detector comprises an outer layer, an outer middle layer, an inner middle layer and an inner layer.The inner middle layer and the inner layer are attached and tightly compressed into a whole layer.The outer middle layer detachably covers the inner middle layer, and the outer layer detachably covers the outer middle layer.The outer layer is a full-silver fiber knitted fabric layer made of composite fibers formed by fusing silver ions and common fabric, the full-silver fiber knitted fabric layer has good air permeability and has antibacterial function, the anti-radiation shielding value is not lower than 70 DB, static electricity can be eliminated, and shielding performance is stable.The outer middle layer is a deep sea precipitation fabric layer which is a fabric layer formed by blending a metal fiber or silver fiber material and ginned cotton fibers, the metal fiber or silver fiber material is developed through the deep sea precipitation technology, the micronaire value of the ginned cotton fibers ranges from 4.1 to 4.3, and the effective radiation shield value is not smaller than 80 DB.