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Position-spoofing-based attacks seriously threaten the security of Vehicular Ad Hoc Network (VANET). An effective solution to detect position spoofing is location verification. However, since vehicles move fast and the topology changes quickly in VANET, the static location verification method in Wireless Sensor Network (WSN) is not suitable for VANET. Taking into account the dynamic changing topology of VANET and collusion, we propose a Time-Slice-based Location Verification scheme, named TSLV, to resist position spoofing in VANET. Specifically, TSLV transforms the dynamic topology into static topology by time slice and each time slice corresponds to a verification process. The verifier can implement location verification for the corresponding prover. During the verification process, the verifier first filters out vehicles which provide unreasonably claimed locations, and then uses the Mean Square Error (MSE)-based cluster approach to separate the consistent vehicles by time slice, and uses the consistent set for its verification. In addition, security analysis and simulation show that TSLV can defend against the collusion attack effectively.