A light-direction adjustment device, comprising: a housing; a lamp body unit; a light emitting unit comprising a light source; and an adjustment unit comprising a first driving member and a second driving member, wherein said light source is mounted on said adjustment unit and said first driving member and said second driving member are respectively provided at one end portion of said adjustment unit, wherein said first driving member and said second driving member are able to be moved synchronously to change a direction of light emitted from said light source, wherein said housing comprises a first housing, a second housing and two or more heat dissipating elements, wherein two ends of each of said heat dissipating elements are respectively extended to said first housing and said second housing and a heat exchanging space is formed between each of said two adjacent heat dissipating elements, wherein said lamp body unit comprises a first positioning element, wherein said housing has at least a first mounting hole and said lamp body unit has at least a second mounting hole, wherein said lamp body unit further comprises a first mounting member, wherein when said lamp body unit is assembled with said housing, said first mounting member is provided to enclose said housing, and said lamp body unit is installed in said housing by each of said first mounting members through said second mounting holes and each of said first mounting holes, wherein said housing and said lamp body unit form a first receiving chamber and said adjustment unit is positioned in said first receiving chamber, wherein said lamp body unit comprises a second positioning member, wherein said first positioning element and said second positioning member form a positioning groove, wherein when said lamp body unit is assembled with said housing, one end portion of said first housing is mounted in said positioning groove, characterized in that said second housing comprises a first connecting body and a second connecting body, wherein one end portion of said first connecting body is integrally extended to said second housing and the other end portion of said first connecting body has a connecting chamber, wherein one end portion of said second connecting body forms a first driving surface and the other end portion of said second connecting body forms a second connecting member, wherein said second connecting member is mounted in said connecting chamber, wherein said first driving surface is a lower curved surface, wherein said second positioning member forms a second driving surface which is an upper curved surface, and said first driving member and said second driving member are able to be moved synchronously along a trajectory defined by said first driving surface and said second driving surface so as to change said direction of light emitted from said light source. a housing; a lamp body unit; a light emitting unit comprising a light source; and an adjustment unit comprising a first driving member and a second driving member, wherein said light source is mounted on said adjustment unit and said first driving member and said second driving member are respectively provided at one end portion of said adjustment unit, wherein said first driving member and said second driving member are able to be moved synchronously to change a direction of light emitted from said light source, wherein said housing comprises a first housing, a second housing and two or more heat dissipating elements, wherein two ends of each of said heat dissipating elements are respectively extended to said first housing and said second housing and a heat exchanging space is formed between each of said two adjacent heat dissipating elements, wherein said lamp body unit comprises a first positioning element, wherein said housing has at least a first mounting hole and said lamp body unit has at least a second mounting hole, wherein said lamp body unit further comprises a first mounting member, wherein when said lamp body unit is assembled with said housing, said first mounting member is provided to enclose said housing, and said lamp body unit is installed in said housing by each of said first mounting members through said second mounting holes and each of said first mounting holes, wherein said housing and said lamp body unit form a first receiving chamber and said adjustment unit is positioned in said first receiving chamber, wherein said lamp body unit comprises a second positioning member, wherein said first positioning element and said second positioning member form a positioning groove, wherein when said lamp body unit is assembled with said housing, one end portion of said first housing is mounted in said positioning groove, characterized in that said second housing comprises a first connecting body and a second connecting body, wherein one end portion of said first connecting body is integrally extended to said second housing and the other end portion of said first connecting body has a connecting chamber, wherein one end portion of said second connecting body forms a first driving surface and the other end portion of said second connecting body forms a second connecting member, wherein said second connecting member is mounted in said connecting chamber, wherein said first driving surface is a lower curved surface, wherein said second positioning member forms a second driving surface which is an upper curved surface, and said first driving member and said second driving member are able to be moved synchronously along a trajectory defined by said first driving surface and said second driving surface so as to change said direction of light emitted from said light source.