The invention relates to a horizontal type plate freezer. The horizontal type plate freezer comprises a basic part, freezing plates, a lifting device, a top plate, a bottom plate, freezing layers and contour blocks and refrigerant hoses, wherein the freezing plates are arranged in a laminated mode, the freezing plates and the lifting device of the freezing plates are located above the basic part, the top plate is located above the freezing plate at the top layer, the bottom plate is located below the freezing plate at the bottom layer, the freezing layers are arranged between the adjacent freezing plates, the contour blocks are arranged at the two edges of the freezing layers, and the refrigerant hoses are arranged on the freezing plates respectively and are connected with a refrigerant inlet collection pipe and a refrigerant outlet collection pipe; latch pillars are arranged at the two sides of the laminated freezing plates and are fixedly connected with the basic part, the positions, corresponding to all the freezing layers, of each latch pillar are provided with movable latches which are movably connected with the corresponding latch pillar, and the movable latches are driven by movable latch driving devices. Each movable latch bears the weight of the corresponding freezing plate and frozen articles above the movable latch, so the space between every two adjacent freezing plates is increased to facilitate material feeding and discharging operations, the frozen articles on the freezing layers of the rest freezing plates are still in a normal frozen state, and therefore the horizontal type plate freezer is high in efficiency.