A portable wireless communication device includes a base circuit board, an antenna, and a switch. The base circuit board is a printed circuit board including a feed point and a ground point. The antenna is disposed on the base circuit board including a radiating portion, a feed portion, and a plurality of ground portions. The feed portion electrically connected to the feed point. The switch is electrically connected between the ground point and the plurality of ground portions to choose one ground portion to electrically connect to the ground point and obtain wide working frequency bands.