The invention relates to a method for preparing ultrahigh molecular weight polyethylene fibers. Various defects exist in the prior art. The method comprises the following steps of: preparing uniform ultrahigh molecular weight polyethylene gel solution; making the gel solution pass through a filter, a metering pump and a spinneret plate, and applying 1 to 8 times of nozzle traction to the gel solution; molding in a water bath to obtain gel fibers; directly extracting the gel fibers at the temperature of between 20 and 60 DEG C, and drying at the temperature of between 40 and 60 DEG C; and performing 2 to 4 grade of ultra thermal drawing on the dried gel fibers to obtain the ultrahigh molecular weight polyethylene fibers, wherein the temperature of thermal drawing is between 80 and 150 DEG C, and the total times of the thermal drawing is 10 to 60 times. The method improves the product quality, and can prepare the ultrahigh molecular weight polyethylene fibers with high strength and high modulus.