Large dustbin with switchable bottom

The utility model relates to a big garbage bin which the bottom can be opened and closed, the big garbage bin comprises a barrelhead, a barrel body and a barrel bottom, wherein the barrelhead is provided with a carrying handle of human engineering; the two sides of the upward side of the barrel body is respectively provided with a lifting handle of human engineering; the barrel bottom is composed of two semicircular blocks, wherein the central section of the straight flange of one semicircular block is provided with a hollow beam, the two sides of the straight flange of the other semicircular block is respectively provided with a hollow beam which is coincided with that of the central section, the two semicircular blocks are connected with the lower part of barrel body through the hinge; when the two semicircular blocks are closed, a lock rod of the locking device is inserted into the hollow beam on the semicircular blocks, and the T-shaped locking bar connecting with the lock rod is snapped in the arch locking piece on the barrel body. The utility model has the advantages of simple and novel structure, low production costs, convenient and healthy application, and is easy to be promoted and implemented in primary and secondary schools.