The invention relates to a linear frequency modulation radar target speed simulation method and an echo signal simulation source. The linear frequency modulation radar target speed simulation method comprises the following steps that: two direct digital frequency synthesis sources respectively generate linear frequency modulation pulse signals of which the center frequency is f1 and single frequency signals of which the frequency is (f2+fd), wherein the f1+f2=fI, wherein the fI is the frequency of baseband signals which are transmitted by a measured linear frequency modulation radar and is also a Doppler frequency; and after being mixed together, the linear frequency modulation pulse signals and the single frequency signals are further mixed with local oscillator signals f0, such that echo simulation signals can be generated.