The invention relates to a synchronizer used in the manual shifting process of a transmission, in particular to a friction-inertia type locking ring type synchronizer for the manual vehicle transmission and belongs to the technical field of vehicle transmissions. The friction-inertia type locking ring type synchronizer comprises shifting gears, synchronous rings, a shifting fork, an engagement sleeve, a spline hub and a transmission output shaft. The transmission output shaft is provided with an outer spline in the circumferential direction and connected with the spline hub through the outer spline. The outer ring of the spline hub is engaged with the engagement sleeve. The outer ring of the engagement sleeve is provided with a shifting fork groove. The shifting fork is sleeved with the shifting fork groove of the engagement sleeve. The left side and the right side of the spline hub are provided with the synchronous rings. The transmission output shaft is sleeved with the synchronous rings in a spaced manner. The outer sides of the synchronous rings are provided with the shifting gears. Each synchronous ring comprises a synchronous ring basin body, a synchronous ring basin bottom and a synchronous ring basin face. The rear end of the inner ring of each synchronous ring basin body is provided with the corresponding synchronous ring basin bottom. The front end of the outer ring of each synchronous ring basin body is provided with the corresponding synchronous ring basin face.