The invention provides an automatic multimode mobile communication terminal and an automatic frequency control method, wherein, the terminal comprises: a plurality of baseband controllers which are arranged with frequency deviation estimating modules and work at different communication modes; a voltage-controlled clock generator; the baseband controllers are composed of a main baseband controllerand at least one subsidiary baseband controller; the main baseband controller comprises a digital analog conversion module which is used for converting digital control signals output by the requency deviation estimating modules of the main baseband controller or that of the subsidiary baseband controller into analog control signals, and sending the analog control signals to the voltage-controlledclock generator. The invention improves the automatic frequency control stability and the relizbility thereof, reduces the cost of the terminal.