The utility model discloses a portable plant pit excavates instrument, including the mobile jib, cut native blade, apron and safety cover, wherein, cut native blade retention in the bottom of mobile jib, the apron is fixed in on the mobile jib and lies in eager native blade top, offers unearthed mouthful that is used for supplying the earth material business turn over on the apron, safety cover and cover connection, when not using, the safety cover lies in the apron below in order to protect eager native blade, when the excavation, the safety cover lies in in order to hold the earth material that excavates out above the apron. The utility model provides a plant pit is convenient for excavate by portable plant pit excavates instrument, simultaneously convenient earth material clearance to digging out.