The invention discloses an intelligent tripping-preventive power supply device. The power supply device comprises an upper casing, a pedestal, four jack assemblies into which flat insertion pieces of a plug are inserted, an unlocking ring and an unlocking rod; and each jack assembly comprises a sub-casing, a self-locking piece, a self-locking rod, a sleeve into which the flat insertion piece is inserted, a copper bearing, a conductive connecting piece and a conductive rod. Thus, two jacks, except a jack connected to a ground wire, among three jacks of each group can rotate in the surface of the upper casing around an intersection point of two diagonals of a rectangular opening of the jack, so that both three-pole and two-pole flat plugs can be inserted into the three-pole jack, two three-pole flat plugs or two two-pole flat plugs or one three-pole flat plug and one two-pole flat plug can be inserted into the power supply device at the same time, and the using convenience of the power supply device is improved.