The utility model discloses a template with adjustable length belongs to the technical field of construction. Its technical scheme does: a template with adjustable length, includes the baffle of bottom plate, bottom plate one side of step shape and sets up the end plate at the bottom plate both ends, and the top edge of bottom plate sets up the guide way, and the bottom plate bottom is provided with the slide, and the last lower extreme of end plate imbeds the guide way respectively and the slide is interior is connected with bottom plate component sliding fit, is provided with adjusting device between end plate and the bottom plate. The beneficial effects of the utility model are that: can increase the turnover number of times of steel form, improve the steel form utilization ratio, reduce cost reduces extravagantly.