The invention discloses intermediate frequency signal amplitude estimation methods based on energy detection. A method comprises the steps of carrying out subtraction on received mixed signals and locally generated signals at a satellite receiving end, thereby obtaining difference value signals; carrying out demodulation and dispreading operation on the difference value signals according to obtained carrier information and pseudo code information, thereby obtaining baseband signals; computing energy of the baseband signals; taking an amplitude of the strongest received signal as a reference, carrying out normalization setting on amplitude coefficient values, carrying out accumulation change by taking a 1/Q of normalization energy as a stepping interval, and computing corresponding energy values once each time when values are changed; and carrying out statistics on the energy values corresponding to all amplitude coefficient values, and outputting an amplitude coefficient correspondingto the energy minimum value, wherein the amplitude coefficient is an estimated value of the amplitude of a received signal most proximate to an intermediate frequency signal. Through application of the method, influence of multi-address interference can be reduced and eliminated, and an error does not occur in a code tracking loop of a weak signal branch.