| Cover | Feb. 05, 2024 |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Feb. 05, 2024 |
| Entity File Number | 001-40877 |
| Entity Registrant Name | PHOENIX BIOTECH ACQUISITION CORP. |
| Entity Central Index Key | 0001870404 |
| Entity Tax Identification Number | 87-1088814 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 2201 Broadway |
| Entity Address, Address Line Two | Suite 705 |
| Entity Address, City or Town | Oakland |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94612 |
| City Area Code | 215 |
| Local Phone Number | 731-9450 |
| Written Communications | true |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Units, each consisting of one share of Class A common stock and one-half of one redeemable warrant | |
| Title of 12(b) Security | Units, each consisting of one share of Class A common stock and one-half of one redeemable warrant |
| Trading Symbol | PBAXU |
| Security Exchange Name | NASDAQ |
| Class A common stock, par value $0.0001 per share | |
| Title of 12(b) Security | Class A common stock, par value $0.0001 per share |
| Trading Symbol | PBAX |
| Security Exchange Name | NASDAQ |
| Warrants, each whole warrant exercisable for one share of Class A common stock | |
| Title of 12(b) Security | Warrants, each whole warrant exercisable for one share of Class A common stock |
| Trading Symbol | PBAXW |
| Security Exchange Name | NASDAQ |
