Acousto-optic induction alarm device for railway crossing

The utility model discloses an acousto-optic induction alarm device for a railway crossing. The alarm includes a control circuit; the input end of the control circuit is respectively connected with an up/down interface circuit and a lighting circuit, and the lighting circuit is also connected with a face plate indicator light circuit; and the output end of the control circuit is respectively connected with an alarm indicator light circuit, an alarm signal light interface circuit and a speech circuit, wherein the speech circuit is directly connected with an outdoor loudspeaker RL2, and is further connected with an outdoor loudspeaker RL1 through a speech amplifying circuit. The acousto-optic induction alarm can switch indoor/outdoor alarm speech freely, and achieves the additional functions of outdoor alarm speech output and microphone speech input based on the unchanged original alarm device, so that a crossing keeper can remind foot passengers and vehicles of safety, the incidence that passengers in ignoranc