The invention discloses a detection system for a secondary waveform of an independent ignition system. The detection system comprises an adapter, inductive clips, capacitive clips, a waveform oscilloscope, a power supply and a single-chip microcomputer; the adapter comprises a plurality of cylinders; each cylinder is used for containing an independent ignition coil of a to-be-detected ignition system and is correspondingly connected with a spark plug; each inductive clip is in contact with a corresponding first cylinder of the adapter; the capacitive clips are in contact with all the cylinders of the adapter; the single-chip microcomputer is respectively and electrically connected with the inductive clips and the capacitive clips, and is used for receiving electric signals from the inductive clips and the capacitive clips; the single-chip microcomputer is also connected with the waveform oscilloscope, and is used for displaying the received electric signals on the waveform oscilloscope; the power supply is electrically connected with the single-chip microcomputer, and is used for providing a working power supply for the single-chip microcomputer. The invention also discloses the detection adapter for the secondary waveform of the independent ignition system; the detection system and the detection adapter are convenient and practical.