A horizontal oven cover lifting device, comprising a lifting support, a lifting beam fixedly installed on the lifting support, a moving plate and a horizontal driving device for driving the moving plate to horizontally translate, an upper lug plate and a lower lug seat installed on the moving plate through a vertical driving device, the upper lug plate and the lower lug seat being respectively arranged on the upper and lower sides of the moving plate, a plurality of guide shafts fixedly connected between the upper lug plate and the lower lug seat, a linear bearing arranged on the moving plate for cooperating with a guide rod, two vertically arranged pin plates fixedly installed on the bottom of the lower lug seat, an installation gap for cooperating with the cover left between the two pin plates, and a latch inserted on the pin plate at the installation gap. The present application can not only drive the cover to vertically lift, but also horizontally translate, which helps to solve the problems of poor sealing, limited operation space and insufficient adaptability of the existing horizontal oven cover lifting structure.