Double-line dimming and toning COB light source circuit, light source substrate and lamp thereof

The embodiment of the utility model provides a double-line dimming and color-adjusting COB light source circuit, a light source substrate and a lamp thereof. The double-line dimming and color-adjusting COB light source circuit comprises a constant current module; the warm white lamp bead is used for emitting warm white light, and the warm white lamp bead is connected with the constant current module; the cold white lamp bead is used for emitting cold white light, and the cold white lamp bead is connected with the constant current module; the first connecting line is connected with the constant current module; the warm white lamp beads and the cold white lamp beads are connected with the second connecting wire; wherein the current transmission directions of the warm white lamp beads and the cold white lamp beads are opposite. According to the technical scheme, double-line dimming and color modulation processing can be achieved based on a simple circuit structure, and good use experience is brought to a user. 本