The invention particularly refers to a pump block of a high-pressure washer and belongs to the technical field of washing equipment , a crankshaft and a plurality of plungers are arranged in the pump block, the crankshaft is sleeved with a cam, the plungers are arranged around the crankshaft and all perpendicular to the crankshaft, the cam acts on an end of every plunger and drives the plungers to reciprocate linearly, the pump block is provided with a plurality of control valves each positioned between two adjacent plungers, the pump block is provided with a water inlet and a water outlet respectively communicated with cavities of the control valves, and cavities of the plungers are communicated with the cavities of the control valves. The pump block of the invention is simpler in structure, the plungers are driven by the cam sequentially in a centrifugal manner, power output is more coherent, pressure loss is low, fault rate is low, the pump block is simple and convenient to maintain, and it is possible increase plunger quantity and output flow at the premise of not increasing volume of a device; a crankcase is omitted, and there is no need for adding a lubricant between the crankshaft and the plungers.