There are several coffee pulping machines that are commonly used by farmers, but there are some drawbacks to these pulping machines. For example, a pulper machine with a large construction does not allow peeling in the coffee harvesting area. The purpose of this research is to design and build a prototype of a mobile wet coffee peeling machine (pulper). The research method used starts from design analysis. Furthermore, the data from the design analysis was used as the basis for making the prototype of the mobile pulper machine. The testing method used is based on functional tests, structural tests and mobility testing of the mobile pulper to see the feasibility of mobilizing the machine. The results of the study show that the coffee pulper can be mounted on a modified motorcycle frame. The peeling cylinder is rotated by power from the engine and uses a shaft extender as an additional shaft from the engine. The transmission system used is pulley and belt with the ratio of engine pulley and peeling cylinder which is 1:4. The engine rotation in the idle position is 1289 RPM which produces a peeling cylinder rotation of 279 RPM in the test without material and 204 RPM in the test with material. The hopper used is a built-in hopper with a volume of 0.028 m3 or 15 kg of coffee cherries for one filling. It can be concluded that the mobile pulper machine can be used for peeling in the coffee harvesting area.