The invention discloses a grid-connected access anti-reverse-flow intelligent detection method for distributed power generation. The method comprises the following steps: A, the three-phase current and the three-phase voltage of a grid-connected point are acquired; B, the three-phase current and the three-phase voltage are digitally processed, and the positive-sequence current and the positive-sequence voltage of the grid-connected point are calculated; C, the angle difference between the positive-sequence current and the positive-sequence voltage is monitored, whether a reverse-power condition occurs is judged, an instruction is issued if a reverse-power condition occurs, and the method returns to step B if no reverse-power condition occurs; and D, a rising edge drive tripping command output module issues a tripping command to a circuit breaker control module to disconnect a circuit breaker of the grid-connected point. According to the method of the invention, the flow direction of output power of a distributed grid-connected power generation system can be sensitively and accurately identified, and a tripping command is issued when reverse power occurs so as to disconnect the circuit breaker of the grid-connected point.