The invention discloses an emergent load switching method for a grid with the consideration to time fairness of users. The method comprises the steps: performing the statistical operation of the historical load switching data information of a grid load switching user; calculating the time fairness factor of the load switching unit; calculating the user group information of a to-be-switched load user; performing the load switching operation according to the user group information of the to-be-switched load user to complete the emergent load switching of the grid. The historical load switching data information of the grid load switching user is collected, a fairness factor of the load switching unit is calculated under the condition of consideration to the number of load switching times, time period and load switching duration, and the to-be-switched user group information is obtained according to an average user fairness difference minimum optimization model, thereby achieving the emergent load switching for the grid, and effectively improving the fairness of the load switching user for the emergent load switching operation of the grid. Moreover, the method gives consideration to the user data information of a user side, and gives consideration to the fairness, the stability and fairness, and is relatively simple and easy.