A blackboard safety connection device for teaching, used to fix a blackboard (2) on a classroom wall (1), including a fixing device installed in the classroom wall (1) and provided with a hollow cavity (30) inside The connecting device (3), the rear end surface of the blackboard (2) is integrally provided with two deformable connecting arms (21) symmetrically distributed on the left and right, and the two deformable connecting arms (21) are used to Inserted into the hollow cavity (30) of the fixed connection device (3) through elastic deformation, the deformable connection arm part (21) includes a fixed part (22) connected with the blackboard (2), A deformable part (23) connected with the fixed part (22) and a terminal guide part (24) connected with the deformable part (23).