The invention relates to a coil shunt transformer. The transformer comprises at least one phase of high-voltage winding and at least one phase of low-voltage winding, wherein each phase of the low-voltage winding comprises a plurality of parallel coil assemblies, and each coil assembly comprises sub-coils and sub-circuit breakers which are connected in series; and the transformer also comprises a controller for controlling each sub-circuit breaker, and the controller is connected with each sub-circuit breaker and controls all sub-circuit breakers to be simultaneously switched on and off. According to the coil shunt transformer disclosed by the invention, each group of windings in the low-voltage winding are arranged into the mode that the plurality of coils are connected in parallel, and a circuit breaker is serially connected to each coil to ensure that the circuit breaker is integrated in the transformer, and the comprehensive cost of the transformer and the circuit breaker can be effectively reduced.