The application relates to a generating method and device, receiving method and device for a dual-frequency constant envelope multiplexed signal with four spreading signals. According to the method, the four baseband spreading signals s1(t), s2(t), s3(t), s4(t) can be modulated to a frequency f1 and a frequency f2 respectively, so as to generate the constant envelope multiplexed signal on a radio carrier frequency fp=(f1+f2)/2, where the signals s1(t) and s2(t) are modulated on the frequency f1 with carrier phases orthogonal to each other, the signals s3(t) and s4(t) are modulated on the frequency f2 with carrier phases orthogonal to each other, f1>f2. The method comprises: determining a power ratio allocated to the four baseband spreading signals s1(t), s2(t), s3(t), s4(t) in the constant envelope multiplexed signal; storing an additional phase lookup table, wherein the table includes additional phases of an in-phase baseband component I(t) and a quadrature-phase baseband component Q(t) of the constant envel
