A method and a device for transmitting system information, a UE and a network device are provided. The method includes: acquiring scheduling information transmitted from a network device; determining a transmission subframe scheduled by the network device for the system information in accordance with the scheduling information, the system information including first system information and/or second system information, the first system information being system information of a first type, the second system information being system information of a second type; and receiving the system information transmitted from the network device within the transmission subframe.