In order to further study how to improve the quality factor of terahertz metamaterials and improve the detection sensitivity of metamaterials, we carried out the needle point design of a terahertz metamaterials sensor structure. In this paper, taking the double-opening square ring as an example, the double opening slit was designed with a double-needle structure. Through theoretical simulation, the influence of the angle of the double-sided open needle point on the resonant frequency, current distribution, and half-peak width of the resonant peak of the terahertz metamaterial sensor were studied. Furthermore, the Q value was calculated according to the formula, and the enhancement effect of the double-needle design on the detection sensitivity of the double-open square ring was analyzed. The simulation results show that when the needle angle is 150°, the Q value of the sensor can be increased to 5 times of the model without needle pointing. The needle point design proposed in this paper can also be applied to other resonator unit structures. Introducing it into the existing terahertz metamaterial sensor design will help to further improve the sensor detection sensitivity.