The invention relates to a thin-layer wrapper spreading device. A trapezoid scraper consisting of a large baffle, a baffle body and a small baffle is used for wrapping paste; a power switch is switched on, after an output shaft of a vertical motor passes through a decelerator, a driving shaft drives a screw rod fixing frame to rotate, and at the time, the scraper enables the paste to be automatically rotated and uniformly spread; a lateral motor drives a screw rod to rotate forwards, a sliding block slides in the forward direction of a sliding bar, and the paste in the scraper is completely spread for the first time in the circumferential direction; after the sliding block moves to the end part of the sliding bar, the lateral motor drives the screw rod to rotate backwards, the sliding block slides in the backward direction of the sliding bar, and the scraper is used for levelly spreading the paste on a pot surface for the second time; after the sliding block touches a touch switch on the sliding bar, the power switch is in power failure, and spreading of a wrapper once is completed, namely making the wrapper once is completed. Compared with a conventional device adopting a manual spreading manner, the device disclosed by the invention has the advantages that wrapper spreading speed is effectively promoted, and the wrapper molding quality is effectively improved; and the device is suitable for mass production, and has very high economic benefits.