The invention provides an upper cover assembly and an electric pressure cooker. The upper cover assembly comprises an upper cover body, a locking apparatus, a transfer lever, a transmission sliding rod, and a driving apparatus, wherein a guiding sliding groove is formed in the upper cover body; the locking apparatus is provided with a cover buckle and can rotate relative to the upper cover body; the transfer lever is connected with the locking apparatus; the transmission sliding rod can slide along the guiding sliding groove and can be matched with the transfer lever; the driving apparatus is connected with the transmission sliding rod and a cover-opening part; and when the cover-opening part is operated, the driving apparatus drives the transmission sliding rod to slide along the guiding sliding groove to enable the transmission sliding rod to be matched with the transfer lever, so as to drive the locking apparatus to rotate relative to the upper cover body through the transfer lever to unlock the cover buckle and a pot buckle. According to the upper cover assembly provided by the invention, the locking or unlocking of the upper cover assembly and the pot body can be realized by operating the cover-opening part, so that the cover opening and closing operation of the product is simplified, and the product is more convenient and faster to use; and in addition, the cover opening and closing functions can be realized without setting a protruding rotary handle structure on the product, so that the product dimension is reduced.