The present invention relates to a method for producing pressurized liquefied natural gas and to a production system used in same. The method comprises: a dehydration step of receiving natural gas from a natural gas field and dehydrating the natural gas without a process of removing acid gas from the natural gas; and a liquefying step of liquefying the dehydrated natural gas at a pressure of 13 to 25 bars and a temperature of -120 to -95 DEG C without a process of fractionating a natural gas liquid (NGL) from the natural gas so as to produce pressurized liquefied natural gas. According to the present invention, costs for building and maintaining a plant may be reduced, costs for producing liquefied natural gas are reduced, and economic advantages may be obtained, and the length of time required to break even may be shortened in a small or medium-sized gas field, which is difficult to ensure using existing systems.