A track light with phase-switching device , comprising: a track assembly comprising an installation base , a first side wall , and a second side wall , wherein the first side wall and the second side wall are respectively disposed at two opposite sides of the installation base , wherein one end of the first side wall has a first fixation portion , and one end of the second side wall has a second fixation portion ; a light source base assembled with the track assembly , wherein the light source base comprises a heat dissipation base and a light source plate , and the light source plate is located on the heat dissipation base ; a power module comprising a plurality of wirings and a phase-switching device , wherein the power module is electrically connected to the light source plate through the wirings , and the phase-switching device is provided for switching a phase of the wirings characterized by a limiting member , wherein a portion of the limiting member adjacent to the installation base extends toward the second fixation portion , and the second side wall has a limiting portion corresponding to the limiting member , wherein a limiting space is between the liming member and the limiting portion , wherein a limiting structure extends from one side of the heat dissipation base corresponding to the mating portion , and the limiting structure is provided for being inserted into the limiting space , and wherein the limiting structure at least comprises a first positioning portion corresponding to the limiting member and a second positioning portion corresponding to the limiting portion , wherein a hanging groove is between the first positioning portion and the second positioning portion , and a hanging structure extends from a portion of the second side wall adjacent to the second fixation portion , and the hanging structure is provided for hanging with the hanging groove . a track assembly comprising an installation base , a first side wall , and a second side wall , wherein the first side wall and the second side wall are respectively disposed at two opposite sides of the installation base , wherein one end of the first side wall has a first fixation portion , and one end of the second side wall has a second fixation portion ; a light source base assembled with the track assembly , wherein the light source base comprises a heat dissipation base and a light source plate , and the light source plate is located on the heat dissipation base ; a power module comprising a plurality of wirings and a phase-switching device , wherein the power module is electrically connected to the light source plate through the wirings , and the phase-switching device is provided for switching a phase of the wirings characterized by a limiting member , wherein a portion of the limiting member adjacent to the installation base extends toward the second fixation portion , and the second side wall has a limiting portion corresponding to the limiting member , wherein a limiting space is between the liming member and the limiting portion , wherein a limiting structure extends from one side of the heat dissipation base corresponding to the mating portion , and the limiting structure is provided for being inserted into the limiting space , and wherein the limiting structure at least comprises a first positioning portion corresponding to the limiting member and a second positioning portion corresponding to the limiting portion , wherein a hanging groove is between the first positioning portion and the second positioning portion , and a hanging structure extends from a portion of the second side wall adjacent to the second fixation portion , and the hanging structure is provided for hanging with the hanging groove . <EOS>