The invention provides a coding adaption method and device, a mobile terminal and a memory medium. The method comprises the steps of querying a locally stored preset coding value range, obtaining anycoding rate value in the preset coding value range, and calculating a preset code rate value range according to the coding rate value; controlling to-be-adapted devices to carry out coding according to the coding rate value, thereby obtaining output code rate values, and judging whether the output code rate values are in the preset coding value range or not; and replacing the maximum or the minimum in the preset coding value range by the coding rate value if the output code rate values are not in the preset coding value range, returning to the step of obtaining any coding rate value accordingto the replaced preset coding value range, until it is judged that the output code rate values are in the preset code rate range, and setting the coding rate values at this time as the optimum code rates of the to-be-adapted devices. According to the method, the device, the mobile terminal and the memory medium, the optimum code rates are obtained in an automatic, repeated and circular adaptationmode, and the corresponding optimum code rate adaption setting can be carried out on the to-be-adapted devices of different types.