The invention relates to an alloy core spun yarn, in particular to a high-titanium titanium-silicon nitride alloy core spun yarn. The core spun yarn comprises a core layer and a steel skin layer wrapped at the outer portion of the core layer. The core layer is made of titanium-silicon nitride alloy powder with the particle size being smaller than 3 mm. A net-shaped supporting layer made of steel or iron is arranged between the core layer and the steel skin layer. The titanium-silicon nitride alloy powder comprises the following element components including, by mass percent, 1.0%-2.5% of Al, 5%-15% of N, 2.5%-5.0% of Mn, 1.0%-2.5% of Mg, 40%-60% of Ti, smaller than or equal to 0.1% of P, smaller than or equal to 0.1% of S, 35%-50% of Si and the balance Fe. The alloy powder is added in microalloyed steel in a core spun yarn method, the problem of the low recovery rate can be solved, in addition, the use amount of silicon iron and ferromanganese iron can be saved, application of titanium-silicon nitride and a core spun yarn alloy of the titanium-silicon nitride is developed, and obvious economic benefits are achieved.