Groundwater sampling device using a double acting piston

The present invention is coupled to a lower surface of the ground connector (10) and in communication with the upper case 110, a center case 120 and the central casing 120 coupled to a lower surface of the upper case 110, the ground water housing 100 comprising a lower casing 130 that is introduced; A power unit comprising an upper electromagnet 210 and lower electromagnet 230 that is installed in the lower case 130, which is installed in the upper case (110); And the cylinder 310 is installed inside of the center case 120, it is provided inside the cylinder 310 and dividing the interior of the cylinder 310 into Superstructure shaft 311 and the lower space portion 312 drive section including a double-acting piston 320 moving in the vertical direction by the magnetic force of the upper electromagnet 210 and lower electromagnet 230; Is installed in the center case 120 Superstructure the shaft 311 and the lower space 312 from the first communicating tube 410 and the second communicating tube (420) in fluid communication, respectively; And the upper case 110, a first communicating tube 410 and the first check member communicating the lower case 130 with each other and which is opened at the time of static pressure, the upper case 110, the second communication pipe 420 and the lower relates to using a double-acting piston, characterized in that it comprises a ground water sampling apparatus (1000); communicating the case 130 each other, checking unit including a second check member that is opened when the negative pressure.