Pavement friction coefficient testing device

The utility model discloses a pavement friction coefficient testing device which comprises a speed setting trolley, and the tail part of the speed setting trolley is detachably connected with a following trolley; a plurality of mounting grooves with downward notches are formed in the bottom of the following trolley, standard blocks with ferromagnetism are embedded in the mounting grooves, magnets are embedded in the groove bottoms of the mounting grooves, the standard blocks are attracted to the magnets, push holes communicated to the top of the following trolley are formed in the groove bottoms of the mounting grooves, and push rods are slidably connected into the push holes; one end, opposite to the standard block, of the push rod is in transmission connection with a linear reciprocating motion mechanism for pushing the standard block out of the mounting groove, and the linear reciprocating motion mechanism is arranged on the following trolley; a marking ring is arranged at the end, back to the magnet, of t