The invention relates to a multi-line laser radar. The multi-line laser radar comprises a laser emission array for emitting multi-channel of laser beams, a laser receiving array for receiving multi-channel of return laser beams reflected by a target object, a return laser beam sampling device for utilizing a time division multiplexing mode to sample the multi-channel of return laser beams and output the sampled data flow, a control system which is connected with the laser emission array, the laser receiving array and the return laser beam sampling device and is used for controlling working of the laser emission array and the laser receiving array and determining the measured data according to the sampled data flow, and an output device for outputting the measured data. For the multi-line laser radar, the return laser beam sampling device utilizes the time division multiplexing mode to sample the multi-channel of return laser beams and then processes the multi-channel of return laser beams in real time through the control system, so that the timeless of the measuring process can be improved.