The present invention relates to a biosafety workbench that can easily replace a filter cartridge having filtered air. The present invention includes: a housing having an aseptic working space, a flow path in which an intake port and an exhaust port are formed to circulate outside air introduced into the work space, and an outlet formed on one side to communicate with the exhaust port of the flow channel; A filter frame provided at the exhaust port side of the housing; A filter cartridge that is installed horizontally to be interchangeable on the filter frame to filter the outside air introduced into the flow path; A fan unit seated on the upper surface of the filter cartridge and blowing the filtered clean air into the working space, and connected to the filter frame by a parallel crank to move in parallel in the direction of the outlet port to secure a take-out gap through which the filter cartridge is taken out; It is a technical idea to include an opening/closing door rotatably connected to the housing by a hinge so as to open and close the outlet for drawing out the filter cartridge through the withdrawal gap secured by the parallel movement of the fan unit. Accordingly, the present invention has a useful effect in that the filter cartridge can be easily withdrawn and replaced by opening the opening door and pulling the fan unit in the direction of the outlet to form the withdrawal gap.
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