In this paper, symmetrical design of a double gate dielectric modulated junctionless tunnel field effect transistor (DG-DM-JLTFET) based structure is proposed and investigated and for the first time to inspect label-free recognition of biological molecules like uricase, protein, biotin, aminopropyl- triethoxysilane etc. The point when biological molecules get immobilized in nanocavity area, the variation in the drain current, subthreshold slope, and $I_ON/I_OFF$ ratio has been used as the detecting parameters to recognize the sensitivity of the DG-DM-JLTFET for biomolecule recognition by using tcad simulation. A cavity is designed by etching a layer from the substrate, at the side of the gate electrode A dual metal gate structure is framed by utilizing two unique metal entryway anodes to decrease short channel effects of DG-DM-JLTFET. An examination is exhibited to show the effect of fill-in factor of biological molecules on drain current of DG-DM-JLTFET device. The existence of biological molecules in a small region inside the nanocavity area above the tunneling junction results in variation of the electrical properties of the device. This brings about high sensitivity in terms of drain current, subthreshold slope, and $I_ON/I_OFF$ ratio. The proposed device structure gives perceptible outcomes for both (neutral and charged) types of biological molecules.