The invention provides a method for predicting the accumulated output of a new oil well in an evaluation period. The method comprises steps of 1, determining the type of the new oil well; 2, determining the original output of the new oil well; 3, determining a measurement prediction model, using parameters in the step 1 and the step 2 to select an output calculation model, and measuring the accumulated output of the new oil well in the evaluation period; 4, considering influences of the service life of the oil well, adding a well loss factor to correct the declining rate, adding the declining rate of an original model with the annual oil well loss rate to recalculate the accumulated output of the new oil well in the evaluation period; and 5, drawing output prediction curves and accumulated output curves in the evaluation period under two conditions that the oil well is always in normal production and the oil well has losses or is scrapped, determining the average single well accumulated output zone, and evaluating the prediction result risk. The method for predicting the accumulated output of the new oil well in the evaluation period is more in line with the results of the oil well calculation, and ensures the accurate calculation of the accumulated oil production and the predicted output during the evaluation period.