Provided is a method and an apparatus for transmitting uplink control information in a wireless communication system. A wireless device determines the number of a plurality of Reed-Muller (RM) encoders based on the number of bits of a bit sequence indicating uplink control information, and divides the bit sequence based on the determined number of the plurality of RM encoders to generate a plurality of sub-sequences. The wireless device inputs the plurality of sub-sequences into the respective plurality of RM encoders to generate a coded sequence, maps the coded sequence according to a modulation method to generate a plurality of modulated symbols, and transmits the plurality of modulated symbols on an uplink channel.