The invention provides a gate and an imaging lamp. The gate comprises a first main ring piece, a first secondary ring piece and a second main ring piece which are sequentially and coaxially arranged at intervals, wherein a first moving piece is clamped between the first main ring piece and the first secondary ring piece; the first moving piece comprises a first sub moving piece and a second sub moving piece which are oppositely arranged; the first sub moving piece and the second sub moving piece can be far away from each other to form a first gate or can be mutually butted to close the first gate; the first sub moving piece and the second sub moving piece can rotate relative to the first secondary ring piece respectively; two first limit holes arranged at the two sides of a center hole of the first secondary ring piece are formed in the first secondary ring piece; two first limit pieces which are oppositely arranged are respectively arranged on the first sub moving piece and the second sub moving piece; the two first limit pieces on the first sub moving piece are respectively and accordingly arranged in the two first limit holes; and the two first limit pieces on the second sub moving piece are respectively and accordingly arranged in the two first limit holes.