The invention discloses a mass flow inlet thickness storage calculating method based on a minimum heap. According to the mass flow inlet thickness storage calculating method based on the minimum heap,during storage of inlet thickness data, a data structure of the minimum heap replaces a traditional first-in first-out (FIFO) queue data structure, the time complexity of shifting calculation duringinsert operation in the FIFO queue is usually O(n), however, the time complexity of calculation of insert operation in the minimum heap is O(logn), thus required successive shifting operation during updating of the FIFO queue is avoided, the required calculation amount of shifting operation is reduced, and the calculation efficiency is improved. By means of the method, during storage of the inletthickness data, the data structure of minimum heap replaces the traditional FIFO queue data structure, during searching of an inlet thickness value which is currently used, the minimum heap adopts a sequential structure for storage, the time complexity of sequencing in the FIFO queue is usually O(n2), however, the time complexity of sequencing in the minimum heap is O(nlogn), thus the calculationamount required by searching is reduced, and the searching efficiency is improved.