The invention discloses a cloud service-oriented power grid primary model collaborative modeling method and device. The method comprises the following steps: determining a subscription range; generating a derivative canvas; automatically generating corresponding derivative canvas micro-services according to the user information of different users so as to perform model maintenance, and updating the derivative canvas micro-services to the main canvas; detecting whether conflicts exist in the updated data of the derivative canvas of each user; if the conflict exists, combining conflict data by applying a model dynamic combination method, otherwise, judging whether the updated model has an error or not; and if no error exists, updating is carried out, the updated main canvas model is published to the corresponding derivative canvas micro-service, and otherwise, error data is fed back to the corresponding derivative canvas service. According to the method provided by the embodiment of theinvention, the collaborative modeling of the primary equipment model of the power grid facing the cloud service mode can be realized, so that the multi-user rapid, accurate and efficient collaborativemodeling can be supported in the cloud service mode.