The invention relates to an electrical connection assembly of a building photovoltaic component. An electrical connection part of the electrical connection assembly of the building photovoltaic component is composed of a connecting box, an L-shaped positive electrode connector, an L-shaped negative electrode connector, a straight positive electrode connector, a straight negative electrode connector and a U-shaped connector, wherein the L-shaped positive electrode connector and the L-shaped negative electrode connector are connected with the connecting box and are installed on the edge of the inner side of a frame of the building photovoltaic component, the U-shaped connector is connected with the L-shaped positive electrode connector and the L-shaped negative electrode connector and is installed in a groove formed by butt joint of the frames of two adjacent building photovoltaic components, external cables are connected with the L-shaped positive electrode connector and the L-shaped negative electrode connector which are located on the two sides of a serial array of the building photovoltaic component respectively through the straight positive electrode connector and the straight negative electrode connector and is arranged in the groove, and a sealant waterproof layer and an aluminum alloy sealing strip cover each external cable for protection. According to the electrical connection assembly of the building photovoltaic component, only two cables are needed by a whole system, a waterproof function and an air impermeability function are achieved, the strength and the safety performance of the connection position of building photovoltaic components are improved.