The invention discloses a peak-to-average power ratio suppression method based on cyclic shift selective mapping, which comprises the following steps: partitioning binary bits to be sent according tothe length of OFDM symbols, and copying each data block into a plurality of same binary sequences after partitioning; generating a random mutual exclusion displacement value S; performing cyclic shifton each data block, and shifting S at the tail part of the data block to the initial position of the data block to form a new data block; and calculating a PAPR value in each data IFFT result in thenew data block, and selecting the data with the minimum PAPR to send. According to the method, the calculation complexity is greatly reduced, and the data transmission efficiency is improved.