A multi-channel sensing system comprising: a multi-channel sensor connector that wavelength-divides an optical pulse output from a pulsed laser into a plurality of channels in a spectrum domain, transmits each of a plurality of optical sub-pulses generated from the wavelength division to a channel path allocated for each channel in multi-channel paths, multiplexes the plurality of optical sub-pulses passed through the multi-channel paths and outputs an optical signal including the multiplexed optical sub-pulses; and a multi-channel optical phase detector that receives the optical signal output from the multi-channel connector and a reference signal which is synchronized to the pulse laser, and detects a channel-specific electrical signal that corresponds to a time-of-flight between each of the plurality of optical sub-pulses included in the optical signal and the reference signal, wherein the multi-channel connector comprises: a demultiplexer that generates the plurality of sub-pulses corresponding to the plurality of channels from the optical pulse output from the pulsed laser based on wavelength division multiplexing; the multi-channel paths that the plurality of sub-pulses pass through; and a multiplexer that multiplexes the plurality of optical sub-pulses passed through the multi-channel paths, and wherein the time-of-flight of one of the optical sub-pulses passing through one of the channel paths is changed by a sensor, and wherein a plurality of sensors are connected to channel paths selected in the multi-channel paths. a multi-channel sensor connector that wavelength-divides an optical pulse output from a pulsed laser into a plurality of channels in a spectrum domain, transmits each of a plurality of optical sub-pulses generated from the wavelength division to a channel path allocated for each channel in multi-channel paths, multiplexes the plurality of optical sub-pulses passed through the multi-channel paths and outputs an optical signal including the multiplexed optical sub-pulses; and a multi-channel optical phase detector that receives the optical signal output from the multi-channel connector and a reference signal which is synchronized to the pulse laser, and detects a channel-specific electrical signal that corresponds to a time-of-flight between each of the plurality of optical sub-pulses included in the optical signal and the reference signal, wherein the multi-channel connector comprises: a demultiplexer that generates the plurality of sub-pulses corresponding to the plurality of channels from the optical pulse output from the pulsed laser based on wavelength division multiplexing; the multi-channel paths that the plurality of sub-pulses pass through; and a multiplexer that multiplexes the plurality of optical sub-pulses passed through the multi-channel paths, and wherein the time-of-flight of one of the optical sub-pulses passing through one of the channel paths is changed by a sensor, and wherein a plurality of sensors are connected to channel paths selected in the multi-channel paths. a demultiplexer that generates the plurality of sub-pulses corresponding to the plurality of channels from the optical pulse output from the pulsed laser based on wavelength division multiplexing; the multi-channel paths that the plurality of sub-pulses pass through; and a multiplexer that multiplexes the plurality of optical sub-pulses passed through the multi-channel paths, and wherein the time-of-flight of one of the optical sub-pulses passing through one of the channel paths is changed by a sensor, and wherein a plurality of sensors are connected to channel paths selected in the multi-channel paths.