Buried garbage can and self-opening method

The invention relates to a buried garbage can and a self-opening method. The buried garbage can is installed in a foundation pit foundation. The sliding rod is arranged on the buried garbage can in a lifting mode through a guide assembly, the opening and closing grabbing head is arranged at the top of the sliding rod, the transverse rod is fixedly installed at the bottom end of the sliding rod, and the opening and closing transmission mechanisms are symmetrically installed on the two outer side walls of the buried garbage can. The opening and closing transmission mechanism is hinged to the transverse rod and a bottom cover of the buried garbage can, and the lifting action of the transverse rod is converted into the overturning opening and closing action of the bottom cover. The self-opening method comprises the steps of hoisting, automatic opening of the bottom cover, automatic closing and resetting. The bottom cover of the garbage can has an automatic opening and closing function, so that automatic hoisting