The present application relates to a lighting field and discloses a lamp installed through screwing, and a lamp body. The lamp installed through screwing includes a lamp body and an installing bracket. The lamp body is provided with a first fastening part thereon. The installing bracket is provided with a second fastening part thereon. The first fastening part is configured to be inserted into the second fastening part, and the lamp body is screwed, and the first fastening part rotates to fixedly fit the second fastening part. The first fastening part fits the second fastening part through screwing, thereby achieving a quick installation and disassembly.