A washing device for containers for chemical experiments of senior middle schools comprises a bottom plate, a fixing device, a support device, an ejecting device, a motor device, a positioning device, a lifting device, a drive device and a washing structure. A first fixing rod is arranged on the bottom plate. The fixing device comprises a fixing plate, vertical plates, first springs and clamping plates. The support device comprises a first supporting rod, a second fixing rod, a first cross rod and a sliding block. The ejecting device comprises a rotary rod, a first rolling wheel, a connecting ring and a second spring. The motor device comprises a second supporting rod, a second cross rod, a third fixing rod, a first motor, a first output shaft, a first pull line and a first positioning rod. The positioning device comprises a first vertical rod, a limiting rod, a first support and a second rolling wheel. The lifting device comprises a lifting plate, third springs, a second positioning rod and a second support. The drive device comprises a second motor and fifth fixing rods. The washing device can wash the inner surfaces of the chemical experiment containers thoroughly and effectively, the washing efficiency is high, and the manual labor intensity is low.