A multicarrier baseband peak elimination device, comprising: K branches, a peak selection module, an error signal generation module, and an adder; wherein, K is an integer greater than 1; each branch comprises a delayer (101-1, 101-2, 101-K), a digital up conversion module (102-1, 102-2, 102-K), a first numerically controlled oscillator (103-1, 103-2, 103-K), a first multiplier (104-1, 104-2, 104-K), a second numerically controlled oscillator (105-1, 105-2, 105-K), a second multiplier (106-1, 106-2, 106-K), a digital down conversion module (107-1, 107-2, 107-K), an offset pulse generation module (108-1, 108-2, 108-K), and a subtractor (109-1, 109-2, 109-K); an input end of the digital up conversion module (102-1, 102-2, 102-K) and an input end of the delayer (101-1, 101-2, 101-K) are used for connecting baseband signals, an output end of the digital up conversion module (102-1, 102-2, 102-K) is connected to an input end of the first multiplier (104-1, 104-2, 104-K), an output end of the first numerically controlled oscillator (103-1, 103-2, 103-K) is connected to the input end of the first multiplier (104-1, 104-2, 104-K), an output end of the first multiplier (104-1, 104-2, 104-K) of the K branches is connected to an input end of the adder, an output end of the adder is connected in sequence to the peak selection module and the error signal generation module, an output end of the error signal generation module is connected to one input end of the second multiplier (106-1, 106-2, 106-K) in the K branches, an output end of the second numerically controlled oscillator (105-1, 105-2, 105-K) is connected to the other input end of the second multiplier (106-1, 106-2, 106-K), an output end of the second multiplier (106-1, 106-2, 106-K) is orderly connected to the digital down conversion module (107-1, 107-2, 107-K) and the offset pulse generation module (108-1, 108-2, 108-K), an output end of the offset pulse generation module (108-1, 108-2, 108-K) is connected to a minuend end of the subtractor (109-1, 109-2, 109-3), and an output end of the delayer (101-1, 101-2, 101-K) is connected to a subtrahend end of the subtractor (109-1, 109-2, 109-K); the digital up conversion module (102-1, 102-2, 102-K) is configured to: perform N-times upsampling interpolation filtering on an input baseband signal; the digital down conversion module (107-1, 107-2, 107-K) is configured to: perform N-times downsampling decimation filtering on an input baseband signal; the first numerically controlled oscillator (103-1, 103-2, 103-K) is configured to: generate a complex signal with a preset frequency; the second numerically controlled oscillator (105-1, 105-2, 105-K) is configured to: generate a signal at the same frequency as and conjugated with the signal generated by the first numerically controlled oscillator (103-1, 103-2, 103-3); the peak selection module is configured to: screen out a peak signal with an amplitude exceeding a preset threshold in a combined signal output by the adder, and output a peak signal amplitude, a combined signal phase, and location information of the peak signal in the combined signal; the error signal generation module is configured to: calculate a product of the peak signal amplitude and the combined signal phase to obtain an error signal, and output the error signal and the location information; and the offset pulse generation module (108-1, 108-2, 108-K) is configured to: generate a peak elimination sequence at a location corresponding to the location information according to the location information and multiply the peak elimination sequence by an input signal and then output.