The utility model discloses a voltage and current detection device of roof photovoltaic board, this detection device mainly includes: processing module is synthesized to power module, information acquisition module, communication module and data. Power module provides working power supply for whole detection device, the output of information acquisition module's input termination to photovoltaic board, information acquisition module's output is connected to the communication unit, and the magnitude of voltage and the current value of photovoltaic board are gathered to the information acquisition unit to convert it into voltage signal and electric current signal transmission to communication module, the communication unit is responsible for on the one hand transmitting received signal of voltage and current to data and is synthesized processing module, on the other hand be responsible for data between processing module and the WEB server information of synthesizing alternately, data aresynthesized processing module and are integrated received information and judge whether the photovoltaic board breaks down. This detection device is used, collection and teletransmission to roof photovoltaic board voltage and electric current can be realized to the realization is to the detection of whole roof photovoltaic board.