The invention relates to a sand making machine output adjusting method and a sand making machine with adjustable output. The sand making machine output adjusting method comprises the steps that a storage bin for inputting materials into the sand making machine is arranged; when the sand making machine works, the output of the sand making machine is adjusted by adjusting the amount of materials input from the storage bin into the sand making machine; when a large amount of materials are left in the storage bin, the feeding amount of the storage bin can be increased, the feeding amount of the storage bin is reduced when a small amount of materials are left in the storage bin, it is ensured that the sand making machine is operated in a material-rich machining state for a long time, halt of the sand making machine is avoided, and the possibility that the sand making machine is jammed since one-time feeding amount is too large is reduced. Compared with the prior art, work of the sand makingmachine is safer, and the production process can be easily controlled in a centralized mode.