A photonic bandgap type liquid crystal photonic crystal fiber with high thermal tuning sensitivity around room temperature is designed when we fill the cladding air holes of solid-core photonic crystal fiber with liquid crystal of 5CB type. The variation in photonic bandgap with fiber structure parameters, the thermal tuning characteristic of the position of photonic bandgap, the variation in fiber confinement loss with cladding hole ring number and the thermal tuning characteristic of confinement loss are investigated by the finite element method. The results show that the photonic bandgap position of photonic crystal fiber depends strongly on cladding hole diameter. The confinement loss decreases as the ring number of cladding hole increases. The photonic bandgap position and the confinement loss curve are red shifted, and the average thermal tuning sensitivity of 10.3 nm/℃ is achieved at the position of the minimum confinement loss when the temperature increases from 25.1 ℃ to 34.8 ℃. Around the central wavelength of photonic bandgap, a high coupling efficiency between the photonic bandgap type liquid crystal photonic crystal fiber and the fiber with the same structure unfilled with liquid crystal is obtained.