Due to the limitation of structure and material, the sensitivity of traditional optical fiber pressure sensor is difficult to be further improved. Based on the principle of Mach Zehnder interferometer, transverse pressure sensing structure of doped dual core photonic crystal fiber(DC-PCF) is designed. The relationship between pressure sensitivity and fiber structure is analyzed according to the influence of different doping materials and cross-section structure parameters of optical fiber on the pressure-sensitive characteristics, the DC-PCF structure with high pressure sensitivity is obtained by synthesizing the modefield area. The simulation results show that when the incident transmission wavelength is 1550 nm and the length of the dual core photonic crystal is 6 cm, the X polarization pressure sensitivity can reach 37.56 nm/MPa and the Y polarization pressure sensitivity can reach 35.27 nm/MPa. Compared with the traditional photonic crystal transverse pressure sensor, the pressure sensitivity of the sensor structure is increased by nearly 60 times.