The invention relates to a data collection and protocol conversion method for a shore power connecting technology of a ship reaching a port. The method comprises that operation data of passive short power equipment is collected actively, and written into a corresponding global variable; operation data of active short power equipment is monitored and collected, and written into a corresponding global variable; and protocol conversion is carried out on all operation data collected actively or by monitoring, and the data is sent to a front-end processor of communication. On the basis of short power technical theories, equipments of different manufactures and protocols can be connected to one communication management device, and then uploaded to the front-end processor of communication via Ethernet interface, the hardware cost of a monitoring system is reduced, the operability of the monitoring system is improved, and the method is conducive to function expansion, application and popularization of the monitoring system later.