Tactile perception is an important content of bionic intelligent perception， in order to improve the tactile sensitivity of fiber Bragg grating （FBG）， combined with the demand of tactile perception of the fingertip of the machine， this paper proposes a strain-enhanced FBG tactile perception unit. Firstly， based on the analysis of strain sensitisation and tactile perception mechanism， a double-layer cross-type FBG tactile sensing unit based on strain sensitisation is designed， and a rigid spherical multi-point sensitisation structure is used for strain sensitisation； Then， the simulation analysis method was used to optimise the FBG spatial distribution and perform hydrostatic and thermodynamic simulations of the sensing unit. Finally， a haptic perception experiment platform was built， and temperature-force haptic synergistic perception experiments were completed in conjunction with a robotic hand. The simulation and experimental results show that the force haptic sensitivity of FBG₁ and FBG₂ are 18.069 nm/MPa and 1.065 nm/MPa， and the temperature sensitivity are 11.256 pm/°C and 11.153 pm/°C. The tactile sensing unit effectively improves tactile sensing sensitivity with good linearity and repeatability.