The present invention relates to a visible suction diffuser to stably induce the flow of a fluid by being installed inside an inlet of a pump, it protects an impeller by reducing the flow speed of the fluid and removes foreign substances. A traditional suction diffuser had a problem in which it is difficult to grasp the flow rate and flow speed of the fluid from the outside since a means capable of seeing through the inner side is not included. Moreover, a user had to disassemble and inspect the traditional suction diffuser when trouble or a problem occurred since the degree of corrosion of the inner side or the introduction of foreign substances was not evident with the unaided eye. Thus, the traditional suction diffuser has this problem or similar ones in which preventive maintenance is difficult and life service is reduced. To solve the same, in the suction diffuser which includes: an inlet side connection unit to induce the fluid on one side of a body; and a discharge connection unit to discharge the fluid induced in the inner side on the other side, provided is the visible suction diffuser comprising: a penetration unit (30) capable of seeing through the inner side from the outside in the body (20). Therefore, the occurrence of trouble is minimized and service life is extended by grasping the flow rate or the flow speed of the fluid from the outside and the degree of corrosion of the inner side along with the introduction of foreign substances is now visible with the unaided eye so it is possible to take measures without disassembly of the components. As a result, maintenance is convenient and cost of maintenance is reduced.
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