An oil well washing and sand washing tool is provided with a coupling, one end of the coupling is connected with a sand washing tool body, the other end of the coupling is in contact with a spraying head, a check block is arranged between the spraying head and the coupling, one end of the check block is connected with the upper end of the spraying head, the other end of the check block is in contact with a bearing, and therefore the spraying head and the coupling are connected together. A plurality of holes are formed in the upper portion of the spraying head, a hole is formed in the bottommost portion of the spraying head, three layers of holes are formed in the middle of the spraying head, according to two layers of holes, four holes are formed in each layer, in addition, two holes are formed in one layer, and the two holes are distributed in a point symmetry mode. According to the tool, the spraying head can rotate under the condition without extra power sources, the sand washing point of an oil well casing pipe is increased, the sand washing area of the oil well casing pipe is expanded, the washing preparation efficiency of the oil well casing pipe is improved.