The utility model discloses a portable switch access device of emergency power source, include: flat trolley, its side welding has the protective earthing bolt, switch shunting case sets up flat trolley is last, have with the on -vehicle cable junction's of emergency power source car inlet wire master switch and with a plurality of outlet switch that inlet wire master switch electricity is connected, the wire reel for around establishing insulated wire, insulated wire's an end connector with outlet switch connects, and the other end connects directly or is connected with user's load access point through the transitional coupling fastener, and accessory box, set up flat trolley is last for hold multiple transitional coupling fastener, insulating sheath, guard ground wire and multiplexer utensil. This switch access device prolonged insulated wire length, provide polytype transitional coupling fastener and has realized emergency power source branch multichannel, quick, effective access user loads. This switch access device compact structure, removal convenience have promoted on -the -spot emergency power source and have inserted efficiency.