Does the sackbut look like trombone?

Yes, the sackbut looks very similar to a trombone. Both instruments have a slide, a bell, and a mouthpiece. The main difference between the two instruments is that the sackbut is a Renaissance and Baroque instrument, while the trombone is a more modern instrument. The sackbut has a narrower bore and a smaller bell than the trombone, and it also has a more delicate sound.