The invention discloses a distribution method and device for carrier maximum transmission power, relates to the technical field of communications, and can reduce the interference between cells and improve the performance of same frequency network. The method of the invention comprises the following steps: determining the amount of data that can be transmitted by carriers according to the carrier bandwidth and the signal-to-noise ratio, and determining a ratio between the amount of data to be transmitted and the amount of data that can be transmitted as an initial number; acquiring an energy value of each carrier; determining carriers whose energy values are less than an energy threshold as candidate carriers, and determining specified carriers according to the size relationship between the number of the candidate carriers and the initial number; determining the specified maximum transmission power according to the initial number, the number of specified carriers and the initial maximum transmission power; and acquiring a power adjustment factor of each same frequency carrier, and determining the maximum transmission power of each same frequency carrier according to the specified maximum transmission power, the power adjustment factor and the number of the same frequency carriers. The distribution method for the carrier maximum transmission power provided by the invention is suitable for the distribution of downlink maximum transmission power.