A low-voltage connector, comprising an adaptor and a connector main body, the adaptor is provided with a first connector head and a second connector head respectively at a front end and a rear end, the connector main body is plug-connected to the second connector head, and a rear end of the connector main body is adapted to be connected to one or more signal lines; the second connector head is provided with first clipping slots on a left side and a right side, and the connector main body is provided with elastic arms on a left side and a right side that are snap-fitted to the first clipping slots, to prevent the connector main body from disengaging from the second connector head; and the second connector head is provided with second clipping slots on an upper side and a lower side, and the connector main body is provided with longitudinal convex strips on an upper side and a lower side that are snap-fitted to the second clipping slots, to prevent the connector main body from shaking in a left-and-right direction in the second connector head, wherein the adaptor is provided with an engaging lug that protrudes outwardly on a left side or a right side, the engaging lug is provided with a connecting hole, and the adaptor is adapted to be fixed to a housing of another component via the engaging lug, the first connector head is provided with a plurality of matching poles on an outer wall in a length direction; and steps are provided inside the first connector head to gradually reduce internal dimensions, the matching poles are not centered on the outer wall of the first connector head, but are proximal to the side where the engaging lug is located. second connector head respectively at a front end and a rear end, the connector main body is plug-connected to the second connector head, and a rear end of the connector main body is adapted to be connected to one or more signal lines; the second connector head is provided with first clipping slots on a left side and a right side, and the connector main body is provided with elastic arms on a left side and a right side that are snap-fitted to the first clipping slots, to prevent the connector main body from disengaging from the second connector head; and the second connector head is provided with second clipping slots on an upper side and a lower side, and the connector main body is provided with longitudinal convex strips on an upper side and a lower side that are snap-fitted to the second clipping slots, to prevent the connector main body from shaking in a left-and-right direction in the second connector head, wherein the adaptor is provided with an engaging lug that protrudes outwardly on a left side or a right side, the engaging lug is provided with a connecting hole, and the adaptor is adapted to be fixed to a housing of another component via the engaging lug, the first connector head is provided with a plurality of matching poles on an outer wall in a length direction; and steps are provided inside the first connector head to gradually reduce internal dimensions, the matching poles are not centered on the outer wall of the first connector head, but are proximal to the side where the engaging lug is located.