The present invention relates to an injection device for injecting stevia into tomatoes and a method for increasing sugar content of tomatoes using the same, comprising: a pressure tank formed by coupling a bottom plate and one or more side plates around the bottom plate; A plurality of supports installed horizontally or vertically under the pressure tank in the form of a polygonal column or plate; An upper support coupled to the upper circumference of the pressure tank in the form of a rim; A silicon packing bonded to an upper portion of the upper support to a predetermined thickness; A lid hinged to one side of the upper support to cover the upper portion of the pressure tank in a plate shape; A lid rim coupled to the upper outer side of the lid and a plurality of reinforcing ribs horizontally or vertically coupled to the inside of the lid rim; A pair of pneumatic lifting and lowering devices installed on hinged plates coupled to both bottoms of the pressure tank and both sides of the lid and configured to open or close the lid; Compressed air supply and discharge pipe installed through the lid or side plate and attached with an opening/closing valve; A pressure gauge installed to measure the internal pressure of the pressure tank; An air compressor configured to supply high-pressure air to the pressure tank and the pneumatic lifting and lowering device, and to suck air in the pressure tank; A stevia mixture introduced into the inner space of the pressure tank; And tomatoes immersed in the stevia mixture. And, after putting the tomato in the pressure tank and applying a certain air pressure, it is configured to increase the sweetness of the tomato by applying negative pressure to the inside of the pressure tank, and the method for increasing the sugar content is: solid stevia 0.3 per 10 liters of drinking water at room temperature. Preparing a stevia mixture in a ratio of kg to 2 kg; Putting the mixed solution into a pressure tank, and adding tomatoes to the mixed solution so that the ripe tomatoes are immersed in the mixed solution; A pressurizing process of supplying high-pressure air to the pressure tank to pressurize at a predetermined pressure and for a predetermined time; A vacuum process for creating a negative pressure state for a predetermined pressure and a predetermined time by removing air from the pressure tank that has undergone the pressurization step; And a washing process of removing the tomatoes after the vacuum process from the compression tank and washing them.
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