The invention relates to a mutual inductor packaging assembly which belongs to the technical field of low-voltage electrical appliances. The mutual inductor packaging assembly comprises a shell, a current mutual inductor and a voltage sampling circuit. The mutual inductor packaging assembly is characterized in that the middle of the shell is provided with a conducting bus abdicating hole for installing the mutual inductor packaging assembly on a conducting bus of a circuit breaker; an inner shell is formed on the shell and surrounds the periphery of the conducting bus abdicating hole; an accommodating cavity is formed between the outer wall of the inner shell and the inner wall of the shell; the current mutual inductor is packaged in the accommodating cavity; and the voltage sampling circuit is installed on the outer wall of the inner shell and electrically connected with the conducting bus. The mutual inductor packaging assembly has the advantages of being more convenient for installation, saving the internal space of the circuit breaker and improving safety.