The present disclosure provides a method and a device in a User Equipment (UE) and a base station for wireless communication. The UE transmits a first radio signal in a first air-interface resource, and receives first information, the first information including first sub-information and second sub-information. The first air-interface resource belongs to a first air-interface resource subpool, and the first air-interface resource subpool belongs to a first air-interface resource pool; the second sub-information includes Q1 fields, and the second information is used for indicating whether a bit block transmitted in the first air-interface resource pool is correctly received; a first field is one of the Q1 fields, and a first bit is a bit in the first field which is used for indicating whether the first radio signal is correctly received. The present disclosure indicates downlink feedback of grant-free uplink transmission through two levels of sub-information.