The invention discloses a method for improving the load transient response of a single-inductor multi-output power converter. On the basis of a traditional single-inductance multi-output power converter, a load current sampling network is additionally arranged between the source electrode and the drain electrode of a secondary power switch tube in each output branch, the change of current on each output branch switch tube can be directly detected to embody the change of load current, and the current change on the output branch switch tube is taken as feedforward current to timely reflect the change of any path of load current to a control circuit of each branch of a secondary ring. A duty cycle is quickly regulated, quick response is realized, the ripple wave of output voltage is reduced, and the instability of the system is avoided.