Provided is a connecting device for wooden H-beams. The connecting device for the wooden H-beams comprises a U-shaped connecting plate, the U-shaped connecting plate is composed of a bottom plate and two side plates arranged on the bottom plate, the two side plates are connected through rib plates, and bolt holes are formed in the bottom plate. Two adjacent wooden H-beams can be effectively connected through the connecting device and are attached together, the combination is firm, the service life of the wooden H-beams can be prolonged, the extended wooden H-beams are strong in integrity, and the designed stress conditions can be met. The connecting device is simple in structure, reasonable in design and convenient and fast to mount and dismount, labor and time are saved, and the connecting device can be used in a circulating mode.