The invention relates to a delay locked loop detection system and can be used for detecting a working state of a delay locked loop. The system comprises a signal generator which is used for generating a reference clock and providing the reference clock for the delay locked loop; and a measurement device which is used for obtaining clock signals output from the delay locked loop and measuring whether the delay of the clock signals is consistent with expectation. The detection system also comprises at least one of the following circuits: a preposed receiving circuit which is used for receiving the reference clock of the signal generator, amplifying and shaping the reference clock and then providing the amplified and shaped reference clock for the delay locked loop, and a multi-phase multiplex circuit which is used for receiving the clock signal output from the delay locked loop, synthesizing multiple clock signals with different delay and then providing the synthesized signal for the measurement device. The invention also relates to a delay locked loop detection method. According to the system and the method, the delay of the delay locked loop can be measured accurately.