A multi-coil microchannel heat exchanger, comprising: a first coil comprising a first inlet header, a first outlet header, and first microchannel tubes, wherein the first inlet header and the first outlet header both extend along a length direction of the multi-coil microchannel heat exchanger, each of the first microchannel tubes comprises an inlet and an outlet, the first inlet header is in fluid communication with the inlets of the first microchannel tubes, and the first outlet header is in fluid communication with the outlets of the first microchannel tubes; a second coil comprising a second inlet header, a second outlet header, and second microchannel tubes, wherein the second inlet header and the second outlet header both extend along the length direction of the multi-coil microchannel heat exchanger, each of the second microchannel tubes comprises an inlet and an outlet, the second inlet header is in fluid communication with the inlets of the second microchannel tubes, and the second outlet header is in fluid communication with the outlets of the second microchannel tubes; a first inlet connector, fluidly connected to the first inlet header; a first outlet connector, fluidly connected to the first outlet header; a second inlet connector, fluidly connected to the second inlet header; and a second outlet connector, fluidly connected to the second outlet header, wherein the first coil and the second coil are arranged successively along the length direction of the multi-coil microchannel heat exchanger, the multi-coil microchannel heat exchanger comprises a first side and a second side along the length direction, wherein the first inlet connector, the first outlet connector, the second inlet connector and the second outlet connector are all located at the first side, characterized in that the first coil comprises a first windward surface, the second coil comprises a second windward surface, and the first windward surface and the second windward surface are respectively located on different planes. a first coil comprising a first inlet header, a first outlet header, and first microchannel tubes, wherein the first inlet header and the first outlet header both extend along a length direction of the multi-coil microchannel heat exchanger, each of the first microchannel tubes comprises an inlet and an outlet, the first inlet header is in fluid communication with the inlets of the first microchannel tubes, and the first outlet header is in fluid communication with the outlets of the first microchannel tubes; a second coil comprising a second inlet header, a second outlet header, and second microchannel tubes, wherein the second inlet header and the second outlet header both extend along the length direction of the multi-coil microchannel heat exchanger, each of the second microchannel tubes comprises an inlet and an outlet, the second inlet header is in fluid communication with the inlets of the second microchannel tubes, and the second outlet header is in fluid communication with the outlets of the second microchannel tubes; a first inlet connector, fluidly connected to the first inlet header; a first outlet connector, fluidly connected to the first outlet header; a second inlet connector, fluidly connected to the second inlet header; and a second outlet connector, fluidly connected to the second outlet header, wherein the first coil and the second coil are arranged successively along the length direction of the multi-coil microchannel heat exchanger, the multi-coil microchannel heat exchanger comprises a first side and a second side along the length direction, wherein the first inlet connector, the first outlet connector, the second inlet connector and the second outlet connector are all located at the first side, characterized in that the first coil comprises a first windward surface, the second coil comprises a second windward surface, and the first windward surface and the second windward surface are respectively located on different planes.