The invention relates to a new energy access broadband stability multi-level early-warning method of integrated multi-source information. Subsynchronous oscillation signals of the key substation, the new energy power station and the traditional thermal power generating unit of a regional power grid are stationed and monitored at first; broadband 10-90 Hz interharmonic current, voltage and power of the regional power grid and the torsional vibration data of the thermal power generating unit are obtained; and, due to analysis of the interharmonic current, the voltage and the power data, different early-warning levels are designated according to the region oscillation characteristics and the propagation range of the interharmonic in the system. The new energy access broadband stability multi-level early-warning method of the integrated multi-source information disclosed by the invention is used in a WAMS-based subsynchronous monitoring early-warning master station; due to setting of different hierarchical early-warning information, operators can determine the subsynchronous oscillation condition in the system conveniently and intuitively; therefore, corresponding measures can be adopted in time; and the safe and steady operation of the system can be ensured.