The application provides an apparatus, a system, a detector and a detection method for power supply voltage detection. The apparatus connected to an integrated circuit power supply network comprises: a power supply voltage detector, comprising: N buffers, wherein an input terminal of a first buffer is connected to a clock signal, and output terminals of other buffers are connected to the input terminal of an adjacent buffer; N latch chains, each of which comprises M latches, wherein a clock input terminal of each latch is connected to a clock signal, a D terminal of a first latch of each latch chain is connected to the output terminal of a corresponding buffer, and Q terminals of other latches are connected to the D terminal of an adjacent latch, wherein M and N are positive integers, the VDD terminal of each latch is connected to an area in an integrated circuit power supply network where a power supply voltage is to be detected, and a grounding terminal of each latch is connected to a ground; and a voltage regulation module connected to the Q terminal of each latch and configured to detect data output of each latch to determine a magnitude of a power supply voltage.