Large building block convenient to lap and fix

The utility model provides a large building block convenient to lap and fix. A plurality of groups of symmetrical through holes are formed in the upper surface and the lower surface of the building block; a sealing rod is inserted into each group of symmetrical through holes for sealing; inserting grooves are formed in the two ends of the sealing rod, the inserting grooves are used for inserting connecting rods, and when the two building blocks are basically overlapped, the two ends of the connecting rods are inserted into the inserting grooves in the corresponding positions of the two building blocks respectively to complete overlapping and fixing; by means of the connecting structure that the connecting rods are matched with the slots in the surfaces of the sealing rods, stable splicing of two building blocks with large dead weights is achieved, and meanwhile a hidden lap joint structure is achieved; while the stability of the building blocks is guaranteed, a spliced product is more attractive, and the spli