Instrument base capable of adapting to instruments with different specifications

The utility model provides an instrument base which comprises a fixed seat and a load-carrying portion which is installed on the fixed seat, wherein the load-carrying portion comprises a shell, a pair of clamp splices, a gear wheel and a locking mechanism, wherein a chute is formed in the shell, the clamp splices comprise horizontal portions and vertical portions, the horizontal portions are mutually oppositely located in the chute, each of the horizontal portions comprises a rack bar, the vertical portion is extended on the shell, the gear wheel is located in the shell, and is respectively meshed with the rack bar, and the locking mechanism is used to lock or release the pair of clamp splices or the gear wheel. As a slide block used to clamp an instrument can slide along the chute, the load-carrying portion can adapt to instruments with different specifications.