The invention proposes a lamp warning device, which is applicable to a lamp tube and a lamp holder. The lamp tube has two pin sets, and the lamp holder has two slot sets matching with the pin sets, including: a shell, which is arranged on the lamp tube. At least one contact group is formed in the shell. A circuit board is arranged in the shell and is electrically connected with the lamp tube by the contact group. A warning unit is electrically connected with the circuit board. When the lamp holder is started, the warning unit will send out a warning to achieve the function of warning.本創作提出一種燈管警示裝置,適用於一燈管及一燈座,該燈管具有二接腳組,該燈座具有二與該等接腳組相配合的插槽組,包含:一殼體,設置於該燈管。至少一接點組,形成於該殼體。一電路板,設置於該殼體中,藉由該接點組與該燈管電連接。一警示單元,與該電路板電連接,當該燈座啟動,該警示單元發出警示,以達到提醒之功效。