The invention provides a speed determining method for a movement object, and a mobile terminal, and relates to the technical field of communication. The speed determining method for the movement object comprises the following steps: receiving a reflection wave, which is reflected by the movement object, of an emission wave emitted from the first antenna, the second antenna and the third antenna ofthe mobile terminal, wherein the installation positions of the mobile terminals where the first antenna, the second antenna and the third antenna are positioned are not positioned on the same straight line; according to the frequency of the emission wave, the frequency of the reflection wave and the installation positions of the mobile terminals where the first antenna, the second antenna and thethird antenna are positioned, determining the movement speed of the movement object. The scheme of the invention is used for solving the problems that a result obtained by an existing speed determining way is low in accuracy, and system performance is affected.