The invention discloses a spinning projectile initial posture and speed joint measuring method. The method comprises the following steps of (1) building of a projectile-borne sensor measuring scheme and coordinate system transformation, (2) adopting of a spinning projectile rolling speed resolving method, (3) arrangement of a spinning projectile rolling angle rate filter, (4) adopting of a spinning projectile mouth initial speed resolving method, (5) adopting of a spinning projectile mouth initial posture resolving method, and (6) calculating of initial speeds upsilonx, upsilony and upsilonz when spinning projectiles are ejected out of the mouth through the velocity vector projection relationship, that is, according to the following speed. Through the method, accurate measuring of spinningprojectile initial posture parameters is achieved.