The invention relates to a security reinforcement method and system for a power utilization information collection terminal. The method comprises the steps: temporarily authorizing the power utilization information collection terminal, and performing the first protocol expansion of the temporarily authorized power utilization information collection terminal; monitoring a port of the power utilization information collection terminal, and performing the second protocol extension of the port; performing the security authentication of the USB port of the power utilization information collection terminal. The method is beneficial to enhance the overall security of a power utilization information collection system.