The invention provides a sweep signal generator capable of generating a plurality of frequency markers. The sweep signal generator comprises a control unit, a sweep signal generating unit and a frequency marker generating unit. The sweep signal generating unit comprises a sweep state control unit, a sweep time accumulator and a sweep curve memory. The control unit is used for setting the sweep state and a sweep curve. The sweep state control unit generates a time control word according to the sweep state. The sweep time accumulator generates a read address according to the time control word. The sweep curve memory is used for generating a sweep point according to the sweep curve and the read address. The control unit is also used for reading frequency point enabling information. The frequency marker generating unit comprises a frequency point memory and a frequency marker shaping unit. The frequency point memory is used for generating a frequency point marker signal according to the frequency point enabling information and the read address. The frequency marker generating unit generates the frequency marker signal according to the valid state of the frequency point marker signal. The sweep signal generator of the invention can generate a plurality of frequency markers and furthermore can differentiate the sweep state of the frequency marker.