The invention relates to a photonic crystal optical fiber with a similar intensity multi-peak Brillouin scattering spectrum. A section of photonic crystal optical fiber is internally provided with round air holes which are arrayed in a regular triangle shape; the refractive index of the round air hole filled with air is 1; an optical fiber material of the photonic crystal optical fiber is pure quartz glass, the refractive index is 1.45, the sound velocity is 5972m/s and the density is 2203kg/m<3>; the section of the photonic crystal optical fiber is internally provided with round air holes which are arrayed from inside to outside and the distance lambda between the adjacent round air holes is 2.35mum; the diameter dh of two layers of the air holes in the section is 2.3mum and the diameter dh of the other layers of air holes is 2.1mum to 2.3mum; and when the wavelength of incident light is 1.55mum, the power with a peak value in the Brillouin scattering spectrum of the photonic crystal optical fiber has the difference of four peaks within 2dB. The photonic crystal optical fiber can be effectively used in a distributed type optical fiber sensing system based on a Brillouin scattering beating spectrum, and high-precision and rapid distributed measurement of temperature and strain is realized.