A polar code transmission method, comprising: performing, by a transmit end, polar encoding on a to-be-encoded first bit sequence, to generate an encoded sequence; performing, by the transmit end, a transformation operation on the encoded sequence, to obtain a second bit sequence, wherein the transformation operation comprises at least one of scrambling, interleaving, and reordering; and sending, by the transmit end, the second bit sequence in M inconsecutive time units, and wherein at least two time intervals between the time units in the M inconsecutive time units are unequal; wherein the transformation operation comprises: performing, by the transmit end, two levels of grouping on the encoded sequence, wherein the encoded sequence is divided into L parts through the first level of grouping and each of the L parts of the encoded sequence is divided into P parts through the second level of grouping; and transforming, by the transmit end, a sequence obtained after each-level grouping by performing first-level interleaving on the L parts and second-level interleaving on the P parts, wherein a transformation amount used to transform the sequence obtained after a respective one level of grouping is used to indicate a time sequence index value in a respective one level of time sequence transmission, wherein the transformation amount is a specific transformation value for each type of transformation operation; wherein the first-level interleaving in each time unit is based on the time intervals between the M inconsecutive time units. performing, by a transmit end, polar encoding on a to-be-encoded first bit sequence, to generate an encoded sequence; performing, by the transmit end, a transformation operation on the encoded sequence, to obtain a second bit sequence, wherein the transformation operation comprises at least one of scrambling, interleaving, and reordering; and sending, by the transmit end, the second bit sequence in M inconsecutive time units, and wherein at least two time intervals between the time units in the M inconsecutive time units are unequal; wherein the transformation operation comprises: performing, by the transmit end, two levels of grouping on the encoded sequence, wherein the encoded sequence is divided into L parts through the first level of grouping and each of the L parts of the encoded sequence is divided into P parts through the second level of grouping; and transforming, by the transmit end, a sequence obtained after each-level grouping by performing first-level interleaving on the L parts and second-level interleaving on the P parts, wherein a transformation amount used to transform the sequence obtained after a respective one level of grouping is used to indicate a time sequence index value in a respective one level of time sequence transmission, wherein the transformation amount is a specific transformation value for each type of transformation operation; wherein the first-level interleaving in each time unit is based on the time intervals between the M inconsecutive time units. performing, by the transmit end, two levels of grouping on the encoded sequence, wherein the encoded sequence is divided into L parts through the first level of grouping and each of the L parts of the encoded sequence is divided into P parts through the second level of grouping; and transforming, by the transmit end, a sequence obtained after each-level grouping by performing first-level interleaving on the L parts and second-level interleaving on the P parts, wherein a transformation amount used to transform the sequence obtained after a respective one level of grouping is used to indicate a time sequence index value in a respective one level of time sequence transmission, wherein the transformation amount is a specific transformation value for each type of transformation operation; wherein the first-level interleaving in each time unit is based on the time intervals between the M inconsecutive time units.