The utility model discloses a simple brushless rotary transformer, and belongs to the field of electrical equipment. According to the technical scheme, the simple brushless rotary transformer comprises a resolver and a transformer and is composed of a rotor bearing, a shell, a resolver stator, a transformer stator, a transformer primary winding, a transformer rotor thread reel, a transformer secondary winding and a resolver rotor. The transformer primary winding is connected with the resolver rotor, and the transformer primary winding and the resolver rotor are arranged on the transformer rotor thread reel and rotate at the same time. The transformer secondary winding and the transformer stator form a concentric circle. The transformer primary winding transmits signals of a resolver winding on the rotor to the transformer secondary winding on the transformer stator through an air gap. The simple brushless rotary transformer has the advantages that due to the adoption of the brushless design, maintenance is not required, the service life is long, and the simple brushless rotary transformer is not sensitive to mechanical and electrical noise; the cost can be reduced, the quite high precision is achieved, the manufacturability is good, use is reliable, the design is reasonable, the structure is compact, and the application range is wide.