Fixing device, teaching aid test equipment and substrate fixing equipment

The utility model relates to the technical field of part fixing, in particular to a fixing device, teaching aid test equipment and base plate fixing equipment. The fixing device comprises a fixing piece and a plurality of connecting pieces. The plurality of connecting pieces are connected to the fixing piece in a sliding manner; the connecting piece is used for being detachably and fixedly connected with an external mechanism. The utility model can be used in two technical fields, namely the field of teaching aids and the field of fixing substrates of mechanical unit components. When the fixing device is applied to teaching aid demonstration, a user can adjust the position of the connecting piece on the fixing piece, so that the requirement that the connecting piece is connected with different teaching aids is met, the user can replace the teaching aids on the fixing piece, the content on demonstration equipment is diversified, and students can learn conveniently. And the number of components of the fixing de