A powder laying device comprises a first powder supply cart, a first switch device, a first powder collecting groove and a first circulation system. Powder to be formed is loaded in the first powder supply cart. When the first powder supply cart runs in a first direction, the first switch device is in an open state, and the first powder supply cart is used for laying the powder to be formed in a forming area. The first powder collecting groove is used for receiving the powder to be formed exceeding the forming area when the first switch device is in the open state and the first powder supply cart runs to the finish point in the first direction. The first circulation system is used for loading the powder to be formed in the first powder collecting groove into the first powder supply cart. The invention further provides a printer. According to the powder laying device and the printer with the powder laying device, the powder to be formed is recycled into corresponding powder collecting grooves by controlling switch devices, and then the powder to be formed is loaded into corresponding powder supply carts through circulation systems. In this way, serious waste of the powder to be formed can be avoided, and the utilization rate of the powder to be formed is improved.