The invention discloses an adjustable garment making template. The adjustable garment making template comprises a main body; a turning block is arranged at one side of the main body; a round through hole is arranged at the bottom end of the turning block; the turning block is fixedly connected with a telescopic rod at the round through hole; two sliding chutes are arranged at two sides of the mainbody; a sliding plate is arranged between the inner walls of both sides of the main body; strip grooves are configured at two sides of the sliding plate; the sliding plate is provided with a slidingblock group at the strip grooves; the sliding block group comprises a plurality of sliding blocks; the sliding blocks are in sliding connection with the sliding plate at the strip grooves; the slidingplate is T-shaped; two fixing blocks are fixedly connected at the two sides of the sliding plate; and the top ends of the fixing blocks are configured with first through holes. Compared with an existing device, by setting the sliding plate, the fixing blocks and the sliding block group, the length of the garment making template can be adjusted through the sliding of the sliding plate, and the width of the sliding plate can be adjusted and clothes can be fixed through the sliding block group, so that garment marking can be more convenient.