A laser device is capable of coaxially outputting visible light and invisible light. The laser device includes a seed source outputting the invisible light, a visible light source outputting the visible light, a first wavelength division multiplexing module and N amplification modules, N is a positive integer. The seed source outputs pulsed laser to the amplification modules. The amplification modules perform power amplification on a signal passing therethrough to obtain a signal with power amplified. The first wavelength division multiplexing module performs wavelength division multiplexing processing on the visible light and the invisible light to ensure that an output end of the laser device is capable of coaxially outputting the visible light and the invisible light.