A vacuum load switch, mainly comprising three phases of high-voltage conductive circuits (1) that are independent from each other and are designed consistently, an operating mechanism (2), a supporting box (3) and a transmission device (4). Each phase of high-voltage conductive circuit comprises a load switch unit (10) having a vacuum arc-extinguishing chamber, a disconnecting switch unit (11) and a grounding switch unit (12). The operating mechanism (2) comprises a load switch operating mechanism (20) for controlling the load switch units (10) and a disconnecting and grounding operating mechanism (21) for controlling the disconnecting switch units (11) and the grounding switch units (12). The vacuum load switch further comprises the one-piece supporting box (3) as well as a transmission device (41) for the load switch units (10) and a transmission device (42) for the disconnecting switch units (11) and the grounding switch units (12).
