The invention discloses an H-bridge-based hybrid active filter. A passive filtering unit and an active filtering unit are connected in series and then connected with a harmonic source in parallel to be connected to a power grid; the passive filtering unit comprises a mono-tuning filter, thereby filtering load harmonic, bearing the fundamental wave voltage of the power grid, reducing the fundamental wave voltage on the active filter, and bearing reactive compensation; by virtue of the active filtering unit, the filtering characteristic of the passive filtering unit can be optimized, and resonance of the power grid and the passive filtering unit also can be suppressed; and by virtue of the provided insertion negative sequence current mode, the problem of inter-three-phase direct voltage imbalance can be solved.