Abstract: An on-off dimming and color-fixing lamp comprises a lampshade, a lamp holder, a control panel and a light source with a plurality of LED beads. The lampshade is connected with the lamp holder. The lampshade and the lamp holder form an accommodating cavity after connection. The control panel and the light source are both positioned in the accommodating cavity. The control panel comprises a control module, a power module and a drive module for driving the plurality of LED beads; the power module is electrically connected with the lamp holder, and the power module and the drive module are both electrically connected with the control module; and the light source is electrically connected with the drive module. The control panel also comprises a zero-pass detection module, and the zero-pass detection module is electrically connected with the control module. The plurality of LED beads can flash synchronously. The whole structure is simple. The preparation cost is low.