| Document and Entity Information | Jun. 04, 2023 |
| Document And Entity Information [Line Items] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001870404 |
| Document Type | 8-K |
| Document Period End Date | Jun. 04, 2023 |
| Entity Registrant Name | PHOENIX BIOTECH ACQUISITION CORP. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-40877 |
| Entity Tax Identification Number | 87-1088814 |
| 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 |
| Entity Ex Transition Period | false |
| Units Each Consisting Of One Share Of Class A Common Stock And One Half Of One Redeemable Warrant [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 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 |
| Common Class B [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 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 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Warrants, each whole warrant exercisable for one share of Class A common stock |
| Trading Symbol | PBAXW |
| Security Exchange Name | NASDAQ |
