The invention discloses a distributed power supply grid connection interface device which comprises a shell. A field control panel and a display panel are disposed on the shell. A bus plate is disposed in the shell. The bus plate is provided with working voltage, a power supply plug-in, a CPU (central processing unit) plug-in, an alternating current sampling plug-in, a smart I/O (input/output) plug-in, a remote communication plug-in and a serial communication plug-in. The CPU plug-in is in signal connection with the alternating current sampling plug-in, the smart I/O plug-in, the remote communication plug-in and the serial communication plug-in respectively. By the distributed power supply grid connection interface device, circuit signals of secondary equipment in grid connection circuits can be processed in a centralized manner, grid connection circuit wiring can be optimized, secondary equipment intensification is facilitated, maintenance by a user is facilitated, and popularization is facilitated.