The invention discloses a multi-mode programmable frequency divider. The multi-mode programmable frequency divider includes the following components of: cascaded 2/3 frequency division units, wherein the number of units without no frequency dividing ratio extension bits and the number of units with extension bits are Ne and n-Ne respectively; a real-time power consumption control circuit which is composed of n-Ne-1 stages of two-input AND gates; and a power source switching control transistor. Inverting signals of a frequency dividing ratio control bit of the n-th stage of frequency division unit is connected with a power source control bit of the n-th stage of frequency division unit, and the inverting signals and inverting signals of a frequency dividing ratio control bit of the n-1-th stage of frequency division unit are connected with the input ends of the n-th stage of AND gate, and the output end of the n-th stage of AND gate is connected with a power source control bit of the n-1-th stage of frequency division unit, and the output end of the n-th of stage AND gate and inverting signals of a frequency dividing ratio control bit of the n-2-th stage of frequency division unit are correspondingly connected with the input ends of an n-1-th stage of AND gate; connection is performed sequentially as the above steps until connection of the n-Ne-th stage of frequency division unit and the n-Ne-1-th stage of AND gate is completed; the drain of the power source switching control transistor is connected with power source ends of the frequency division units with extension bits; the source of the power source switching control transistor is connected with a power supplying power source; and the gate of the power source switching control transistor is connected with the power source control bits of the frequency division units with extension bits. With the multi-mode programmable frequency divider of the invention adopted, power consumption waste of the frequency divider can be avoided.