Fixing device between foundation pit assembly type supporting beam and joist

The utility model provides a fixing device between a foundation pit assembly type supporting beam and a joist. Comprising a supporting beam which has an extension direction and is provided with a first supporting surface and a second supporting surface along the extension direction; the supporting beam is placed on the first supporting face, the fastening structure comprises a steel plate structure and an adjusting screw rod, the steel plate structure comprises a first steel plate and a second steel plate, the first steel plate is attached to the second supporting face, the second steel plate is attached to the upper surface of the supporting beam, and the adjusting screw rod is arranged on the first supporting face. And the first steel plate and the second steel plate are fixedly connected through the adjusting screw rod. According to the fixing device between the foundation pit assembly type supporting beam and the supporting beam, the problem that in the prior art, no fixing device is arranged between the