The invention provides a temporary starting grid-connection method of a small unit containing wind, water and fire power systems, relating to the technical field of unit combination scheme formulation under a large-scale wind power integration background. The temporary starting grid-connection method is used for solving the problem that the starting of a small unit can not be accurately controlled when the temporary staring is artificially arranged. The temporary starting grid-connection method of the small unit containing the wind, water and fire power systems is characterized in that four-fifths of calculated amount is reduced by establishing a grid-connected operation generation scheduling linear model of the small unit and blending the output information of a unit in an original day-ahead generation schedule into the model, and the time consumption of calculation is controlled within 40 seconds, so that scheduling personnel can timely obtain accurate information, thus the starting of the small unit is controlled. According to the temporary starting grid-connection method, when the predicted deviations of a load and wind power are relatively large, 10% of power shortage is reduced, and then, accidents such as large-scale load limitation, under-frequency load shedding and large-scale power failure are avoided. The temporary starting grid-connection method is suitable for formulating a scheduling strategy for the temporary starting of the small unit when the predicted deviations of the high wind power permeability network load and wind power are relatively large.