A vortex insect trap includes an insect trapping container, a fan and an insect-killing device. The insect trapping container internally defines an air flowing space, in which the insect-killing device is disposed. The air flowing space is enclosed in at least one flow-guiding wall surface and communicable with external environment via an air suck-in port and an air exit port of the vortex insect trap. The fan is mounted to the air exit port for sucking in external air via the air suck-in port and discharging air inside the air flowing space from the insect trapping container via the air exit port. When the fan operates, air sucked into the air flowing space flows along the flow-guiding wall surface to form a spiral air flow that flows toward a bottom of the air flowing space while carries insects sucked into the air flowing space to the insect-killing device.
