The invention discloses a distributed power source grid connected access device. The distributed power source grid connected access device comprises an input end, a DC boost circuit, an inverter circuit, an EMI filter and an output end which are sequentially connected, and further comprises an auxiliary power source and a control system, wherein the auxiliary power source is used for supplying power for the control system, the control system comprises a push-pull control circuit, a DSP controller, a MPPT algorithm module and an AD acquisition circuit, input voltage and input current are acquired by the AD acquisition circuit and are taken as the original data for algorithm control to transmit to the DSP controller, over-current over-voltage determination is carried out by the DSP controller according to the original data, modulation is carried out through the MPPT algorithm module according to a determination result, and the push-pull control circuit is made to act to adjust the input voltage and the input current. Compared with a distributed power source system in the prior art, the distributed power source grid connected access device is advantaged in that distributed power source grid connected can be realized effectively and efficiently.