The embodiment of the invention provides a coherent multi-carrier capturing method and device, and the method comprises the steps: generating a Doppler factor/code phase two-dimensional plane of a subcarrier for a received signal of a subcarrier signal, searching a code phase maximum value on the two-dimensional plane, and the code phase maximum value serving as a code phase estimation value; calculating a carrier phase compensation amount of the subcarriers according to the code phase estimation value, obtaining a receiving signal subjected to carrier phase compensation by combining a two-dimensional plane, and carrying out coherent combination on the receiving signals subjected to carrier phase compensation of all subcarriers; and comparing the merged received signal with a preset monitoring threshold to obtain a correlation peak exceeding the monitoring threshold, and respectively obtaining the frequency offset value and the propagation delay of the subcarrier according to the Doppler factor and the code phase of the correlation peak on the two-dimensional plane of the subcarrier. According to the embodiment of the invention, the defects of a non-coherent capturing method in a high-dynamic, large-frequency-point coverage range and weak-signal environment are overcome, the capturing performance is greatly improved, and the average capturing time is shortened.