A multicarrier baseband peak elimination device and method are disclosed. The device includes: K branches, a peak selection module, an error signal generation module, and an adder; wherein K is an integer greater than 1; and each branch includes a delayer, a digital up conversion module, a first numerically controlled oscillator, a first multiplier, a second numerically controlled oscillator, a second multiplier, a digital down conversion module, an offset pulse generation module, and a subtractor.