The invention discloses an intelligent dimming controller suitable for dimming in a large-area spatial place. The intelligent dimming controller comprises an internal dimming module and a bypass switch, wherein an air switch is connected between the internal dimming module and an external power supply source; the internal dimming module comprises an MCU master control module, an internal power supply, a dry contact module connected with the MCU master control module, a photoelectric coupler connected with the MCU master control module and a bidirectional thyristor circuit connected with the MCU master control module; a choking coil is connected to the inside of the bidirectional thyristor circuit; the bidirectional thyristor circuit is connected with a load output plate; the bypass switch is connected between the load output plate and an air switch; the MCU master control module is connected with a control terminal and a PC through a 485 communication circuit separately; the 485 communication circuit and the dry contact module are connected with two input pins of the MCU master control module respectively; the bidirectional thyristor circuit is connected with an output pin of the MCU master control module; and the dry contact module is connected with a current feedback module.