The invention discloses a display panel, an air conditioner and a manufacturing method of the display panel. The display panel comprises a panel body, a primer layer adhering to the front side of thepanel body and a thermoprinting layer adhering to the primer layer, wherein the primer layer is white, the panel body is semitransparent and comprises a decoration part and a pattern part, the front side of the decoration part protrudes out of the front side of the pattern part, a continuous decoration plane is formed on the portion, at the decoration part, of the thermoprinting layer, and patterns are formed on the portion, at the pattern part, of the thermoprinting layer. The display panel is free of halation, the thermoprinting layer is not prone to damage, and the thermoprinting layer hasa clear display effect after being applied to a specific product.