The announcement comes ahead of a new law being unveiled on Tuesday, which bans the Chinese firm from the network.
Digital Secretary Oliver Dowden said he was pushing for the "complete removal of high-risk vendors" from 5G networks.
The new deadline falls earlier than expected, although maintaining old equipment will still be allowed.
Huawei told the BBC it would not be commenting on the announcement.
Attempts to rid Huawei from the network have been ongoing for more than a year.
