Disclosed are an intelligent pesticide tank assembly (100) and a plant protection machinery. The intelligent pesticide tank assembly comprises a cover body (2) and a measuring assembly (3), wherein the measuring assembly can be arranged to be extended into a pesticide tank body (1), and the cover body is arranged to be capable of being connected to the pesticide tank body and to enable the measuring assembly to be pressed and fixed onto the pesticide tank body. When the intelligent pesticide tank assembly is disassembled, the measuring assembly can be axially inserted or pulled out, and is then pressed and fixed by using the cover body, so that the measuring assembly is prevented from rotating together with the cover body when the cover body is tightened, and the disassembly of various components can thus be easily completed.