In order to reduce the strong absorption of terahertz by water when detecting solution samples and improve sensitivity of sensor, we propose two dual-band terahertz sensors based on metamaterial absorber integrated microfluidic. The unit resonance structure of the two sensors is composed of metal ring and double I-type cross structure, which produces two perfect absorption peaks in the frequency range of 0.2--1.4 THz, and the refractive index sensitivity can reach 300 GHz/RIU. Experimental results show that the designed two dual-band terahertz sensors have polarization insensitivity and wide incident angle insensitivity, and keep good sensing performance within fabrication tolerance range -4%--4%, and have potential application in the field of biomedicine.