Drill bit length detection device

The utility model discloses a drill bit length detection device, and relates to the technical field of drill bit production auxiliary tools. Comprising a workbench; the material carrying plate is arranged on the workbench, and a plurality of limiting grooves which are adjacently formed side by side are formed in the material carrying plate; the positioning assembly is arranged adjacent to the material carrying plate and located at one end of the limiting groove; the positioning assembly comprises a positioning plate and a first driving piece for driving the positioning plate to be transversely close to or far away from the end part of the limiting groove; the detection assembly is arranged adjacent to the material carrying plate and located at the other end of the material carrying plate relative to the positioning assembly, the detection assembly comprises a second driving part, a sliding assembly and a detection module, and the detection module is arranged on the sliding assembly; the second driving piece i