A waveform-shaping circuit, a liquid crystal display device having the same, and a driving method for the same are provided. The device includes a pixel unit, a data line for transmitting a data signal to the pixel unit, a clock signal generation chip for generating a first clock signal and a second clock signal, a waveform-shaping circuit connected with the clock signal generation chip for receiving the first clock signal and the second clock signal, outputting a scanning signal having a trimmed rising edge as a chamfered waveform according to the first clock signal and the second clock signal, and a scanning signal for transmitting the scanning signal having the trimmed rising edge to the pixel unit. The present invention can reduce the waveform difference of the scanning signals at two sides and a middle portion of a panel in order to increase the display quality of the device.