A handheld printer, comprising; a printer body, the printer body comprises a printing panel; the printing panel is provided with at least two nozzles, the at least two nozzles are sequentially arranged in a staggered way and spaced apart from each other; the printer body comprises a top cover, a left side cover, a right side cover, and an electronic control module; two sides of the printing panel are respectively connected with the left side cover and the right side cover to form an upward opening; the printer body further comprises an upper cover, an ink cartridge support module, and ink cartridges, the upper cover is arranged at the opening, two opposite sides of the upper cover are connected to the left side cover and the right side cover, respectively; the ink cartridge support module is arranged below the upper cover, the ink cartridges are installed between the upper cover and the ink cartridge support module; and the ink cartridge support module comprises a plurality of ink cartridge locking plates, the plurality of ink cartridge locking plates are arranged sequentially in a direction from the left side cover to the right side cover and spaced apart from each other, a locking groove for installing an ink cartridge is formed between every two adjacent ink cartridge locking plates, all of locking grooves are arranged in a staggered way and spaced apart from each other, and the upper cover is connected to tops of the plurality of ink cartridge locking plates, characterized in that the handheld printer further comprises a protective nozzle cover and a handle, wherein the protective nozzle cover and the handle are arranged at two opposite ends of the printer body, wherein the printing panel is located at an inner side of the protective nozzle cover, wherein the printer body further comprises a touch screen, the touch screen is fixed on the left side cover, the electronic control module is fixed on an inner side of the left side cover, the touch screen and the electronic control module are electrically connected, and wherein the top cover is movably connected with the right side cover so that the electronic control module is in an on-or-off state when the opening is opened or closed. a printer body, the printer body comprises a printing panel; the printing panel is provided with at least two nozzles, the at least two nozzles are sequentially arranged in a staggered way and spaced apart from each other; the printer body comprises a top cover, a left side cover, a right side cover, and an electronic control module; two sides of the printing panel are respectively connected with the left side cover and the right side cover to form an upward opening; the printer body further comprises an upper cover, an ink cartridge support module, and ink cartridges, the upper cover is arranged at the opening, two opposite sides of the upper cover are connected to the left side cover and the right side cover, respectively; the ink cartridge support module is arranged below the upper cover, the ink cartridges are installed between the upper cover and the ink cartridge support module; and the ink cartridge support module comprises a plurality of ink cartridge locking plates, the plurality of ink cartridge locking plates are arranged sequentially in a direction from the left side cover to the right side cover and spaced apart from each other, a locking groove for installing an ink cartridge is formed between every two adjacent ink cartridge locking plates, all of locking grooves are arranged in a staggered way and spaced apart from each other, and the upper cover is connected to tops of the plurality of ink cartridge locking plates, characterized in that the handheld printer further comprises a protective nozzle cover and a handle, wherein the protective nozzle cover and the handle are arranged at two opposite ends of the printer body, wherein the printing panel is located at an inner side of the protective nozzle cover, wherein the printer body further comprises a touch screen, the touch screen is fixed on the left side cover, the electronic control module is fixed on an inner side of the left side cover, the touch screen and the electronic control module are electrically connected, and wherein the top cover is movably connected with the right side cover so that the electronic control module is in an on-or-off state when the opening is opened or closed.