Abstract: The present disclosure provides an electrical connection module and a board-to-board electrical connection device. The board-to-board electrical connection device comprises an upper circuit board, a first complementary connector provided to the upper circuit board, a lower circuit board; and an electrical connection module. The electrical connection module electrically connects the upper circuit board and the lower circuit hoard, and comprises an upper plate, a first connector provided to the upper plate to be mated with the first complementary connector, a lower plate, a plurality of supporting guide assemblies, a plurality of elastic members, an electrical connecting unit and a flexible circuit board. The plurality of supporting guide assemblies connects the upper plate and the lower plate and allows the upper plate to relative to the lower plate.