The invention discloses an automatic molding machine for an automatically-sleeved rubber tube used for a resistor. The machine comprises a rack; the rack is provided with a feed foot-cutting mechanism, a ratchet cylinder indexing mechanism, a rubber tube sleeving mechanism, a rubber tube feeding mechanism, a rubber tube cutting mechanism, a hitch feeding mechanism, a material pressing and discharging mechanism, a K-foot beating mechanism, a lower molding mechanism and a side molding mechanism; the feed foot-cutting mechanism cuts a band-like resistor into single resistors through the ratchet cylinder indexing mechanism, the rubber tube feeding mechanism conveys rubber tubes on a rubber tube mount to the rubber tube cutting mechanism for cutting, the cut rubber tubes are conveyed to the rubber tube sleeving mechanism through the hitch feeding mechanism for automatic sleeving of the rubber tubes on the resistors, the resistors sleeved with the rubber tubes are conveyed to the K-foot beating mechanism through the hitch feeding mechanism for molding, the material pressing and discharging mechanism compacts the resistors, the lower molding mechanism bends K-foot of the resistors, the side molding mechanism carries out bending and molding on the K-foot of the resistors again, and the material pressing and discharging mechanism discharges the resistors which have been sleeved with the rubber tubes and have been molded to a discharge spout. According to the invention, automatic molding of automatically-sleeved rubber tubes used for resistors is realized.