The invention provides a method for increasing the smoking point of polyunsaturated fatty acid edible oil. The method comprises the following steps of (1) weighing polyunsaturated fatty acid edible oil and saturated fatty acid edible oil in the molar ratio being (1 to 9) to (9-1 ), pouring the weighed polyunsaturated fatty acid edible oil and the weighed saturated fatty acid edible oil to a container, performing mixing to obtain a mixture, placing the mixture in vacuum environment, and performing drying for 0.5-1.0h; (2) then adding a catalyst which is 0.3%-1.0% of the total mass of mixed oil,wherein the catalyst is sodium methoxide, sodium hydroxide or lipases, then performing vacuumizing, performing heating under the state that the stirring speed is 100-200r/min to 40-90 DEG C, performing a reaction for 0.5-2.0h, after the reaction is finished, performing cooling and centrifugation, and removing the catalyst and saponification substances generated during the reaction; and (3) performing washing with water of 50-70 DEG C for removing the catalyst, and then adding a dehydrating agent which is 2.0-3.0% of the total mass for dehydrating, so that the smoking point of the edible oil can be increased. Experiment proves that the smoking point of the treated edible oil is generally increased by 10-30 DEG C.