The invention discloses a precision forming technique of continuous glass fiber; the chosen components of the glass are as follows: 53.5 to 54 percent of SiO2, 14.2 to 14.8 percent of Al2O3, 6.5 to 6.8 percent of B2O3, 22.5 to 23 percent of CaO, MgO being less than 0.5percent, 0.5 to 0.8 percent of R2O (Na2O, K2O), Fe2O3 being less than 0.4 percent, TiO2 being less than 0.5 percent, 0.3 to 0.5 percent of F; the raw materials of the glass are melt in a melting department according to the material percentage; the glass hotspot temperature in the melting department is controlled within 1350 to 1450 DEG C; the glass temperature at the inlet of a main pathway is controlled within 1370 to 1400 DEG C; the glass temperature at the outlet of the main pathway is controlled within 1360 to 1370 DEG C;, the glass temperature on an operation pathway is controlled within 1260 to 1330 DEG C, and the glass liquid height in the operation pathway is controlled within 250mm to 300mm; the upper mouth of a plate-inserted cooler is arranged at the place that is 2 to 3.5mm from the outlet of a forming tip of a leakage plate; the inlet water temperature of the plate-inserted cooler is controlled within 20 + / - 2 DEG C, and outlet water temperature is controlled within 25 + / - 2 DEG C; the environment flow of the wire drawing process is controlled at 2mm / H2O of negative micro-pressure with the temperature controlled within 20 to 25 DEG C; by adopting the invention, the forming of the continuous glass is more accurate, and end breaking, flying wire and monofilament diameter are evidently reduced; the shortage of uneven density is overcome.