A light source module, comprising: a fixing plate, formed with an aperture in the center; a substrate, set at an inner side of the fixing plate, connected with an illuminate element at where corresponding to the aperture of the fixing plate, and formed with a positive electrode connecting portion and a negative electrode connecting portion to respectively electrically connect to a positive electrode and a negative electrode of the illuminate element; a heat dissipation plate, set at an inner side of the substrate and formed with a positive electrode through hole and a negative electrode through hole respectively at where corresponding to the positive electrode connecting portion and the negative electrode connecting portion; characterised by a fixing base for elastic element, set at an inner side of the heat dissipation plate, having an assembling portion, and formed with a positive electrode perforation and a negative electrode perforation respectively at where corresponding to the positive and the negative electrode through holes (31, 32) of the heat dissipation plate; a positive electrode elastic element, sleeved inside the assembling portion of the fixing base and formed with a positive electrode pin which connected with the positive electrode connecting portion of the substrate by passing through the positive electrode perforation of the fixing base and the positive electrode through hole of the heat dissipation plate; and a negative electrode elastic element, sleeved at an outer edge of the assembling portion of the fixing base and formed with a negative electrode pin which connected with the negative electrode connecting portion of the substrate by passing through the negative electrode perforation of the fixing base and the negative electrode through hole of the heat dissipation plate. a fixing plate, formed with an aperture in the center; a substrate, set at an inner side of the fixing plate, connected with an illuminate element at where corresponding to the aperture of the fixing plate, and formed with a positive electrode connecting portion and a negative electrode connecting portion to respectively electrically connect to a positive electrode and a negative electrode of the illuminate element; a heat dissipation plate, set at an inner side of the substrate and formed with a positive electrode through hole and a negative electrode through hole respectively at where corresponding to the positive electrode connecting portion and the negative electrode connecting portion; characterised by a fixing base for elastic element, set at an inner side of the heat dissipation plate, having an assembling portion, and formed with a positive electrode perforation and a negative electrode perforation respectively at where corresponding to the positive and the negative electrode through holes (31, 32) of the heat dissipation plate; a positive electrode elastic element, sleeved inside the assembling portion of the fixing base and formed with a positive electrode pin which connected with the positive electrode connecting portion of the substrate by passing through the positive electrode perforation of the fixing base and the positive electrode through hole of the heat dissipation plate; and a negative electrode elastic element, sleeved at an outer edge of the assembling portion of the fixing base and formed with a negative electrode pin which connected with the negative electrode connecting portion of the substrate by passing through the negative electrode perforation of the fixing base and the negative electrode through hole of the heat dissipation plate.