The present invention relates to the power system relay production technology field, especially to a portable simulation breaker. The present invention provides a portable simulation breaker. The breaker comprises a housing and a circuit, the circuit comprises a closing branch and an opening branch, the closing branch is configured to simulate the closing condition of the breaker, the opening branch is configured to simulate the opening condition of the breaker, and a closing indicating lamp D1 and an opening indicating lamp D2 are configured to display the closing and opening conditions of the breaker. The circuit is simple, the display is clear and easy to identify, the bad influence caused by repetitive closing and opening of the breaker due to repeated whole group test can be avoid, and the portable simulation breaker is good in practicality; and the portable simulation breaker employs a 9V packed cell for power supply with no need for external connection of 220V alternating current power supply, the structure is portable, and the portable simulation breaker is easy to carry and transport, is suitable for test work of an outdoor transformer substation, and is high in work efficiency and low in running cost.